diff --git a/rings.scaladsl/build.sbt b/rings.scaladsl/build.sbt
index c5553f4..df10dd3 100644
--- a/rings.scaladsl/build.sbt
+++ b/rings.scaladsl/build.sbt
@@ -1,9 +1,15 @@
 import sbt.Keys._
 
 organization := "cc.redberry"
+
 name := "rings.scaladsl"
+
 version := "2.0"
+
 scalaVersion := "2.12.3"
+
+crossScalaVersions := Seq("2.11.11", "2.12.3")
+
 moduleName := name.value
 
 resolvers += Resolver.mavenLocal
@@ -14,4 +20,19 @@ libraryDependencies ++= Seq(
   "com.novocode" % "junit-interface" % "0.11" % Test exclude("junit", "junit-dep")
 )
 
-crossScalaVersions := Seq("2.11.11", "2.12.3")
\ No newline at end of file
+publishTo := Some(
+  if (isSnapshot.value)
+    Opts.resolver.sonatypeSnapshots
+  else
+    Opts.resolver.sonatypeStaging
+)
+
+import sbtrelease.ReleasePlugin.autoImport.ReleaseTransformations._
+
+releaseCrossBuild := true // true if you cross-build the project for multiple Scala versions
+releaseProcess := Seq[ReleaseStep](
+  checkSnapshotDependencies,
+  runClean,
+  runTest,
+  releaseStepCommand("publishSigned")
+)
diff --git a/rings.scaladsl/project/plugins.sbt b/rings.scaladsl/project/plugins.sbt
new file mode 100644
index 0000000..c61b3cc
--- /dev/null
+++ b/rings.scaladsl/project/plugins.sbt
@@ -0,0 +1,5 @@
+addSbtPlugin("com.github.gseitz" % "sbt-release" % "1.0.6")
+addSbtPlugin("org.xerial.sbt" % "sbt-sonatype" % "2.0") 
+addSbtPlugin("com.jsuereth" % "sbt-pgp" % "1.1.0-M1")
+
+
diff --git a/rings.scaladsl/sonatype.sbt b/rings.scaladsl/sonatype.sbt
new file mode 100644
index 0000000..20be434
--- /dev/null
+++ b/rings.scaladsl/sonatype.sbt
@@ -0,0 +1,24 @@
+
+// Your profile name of the sonatype account. The default is the same with the organization value
+sonatypeProfileName := "cc.redberry"
+
+// To sync with Maven central, you need to supply the following information:
+publishMavenStyle := true
+
+// License of your choice
+licenses := Seq("APL2" -> url("http://www.apache.org/licenses/LICENSE-2.0.txt"))
+homepage := Some(url("https://github.com/PoslavskySV/rings"))
+scmInfo := Some(
+  ScmInfo(
+    url("https://github.com/PoslavskySV/rings"),
+    "scm:git@github.com:PoslavskySV/rings.git"
+  )
+)
+developers := List(
+  Developer(
+    id = "PoslavskySV",
+    name = "Stanislav Poslavsky",
+    email = "stvlpos@mail.ru",
+    url = url("http://redberry.cc")
+  )
+)
diff --git a/rings.scaladsl/src/test/scala/cc/redberry/rings/scaladsl/Examples.scala b/rings.scaladsl/src/test/scala/cc/redberry/rings/scaladsl/Examples.scala
index 4c11a18..3b9ba60 100644
--- a/rings.scaladsl/src/test/scala/cc/redberry/rings/scaladsl/Examples.scala
+++ b/rings.scaladsl/src/test/scala/cc/redberry/rings/scaladsl/Examples.scala
@@ -717,23 +717,4 @@ class Examples {
       assert(r1 == r2 * div + rem)
     }
   }
-
-
-  @Test
-  def test1111 = {
-
-    import cc.redberry.rings.poly.univar.UnivariateGCD._
-    import syntax._
-
-    // The ring Z/17[x]
-    implicit val ring = UnivariateRingZp64(17, "x")
-
-    val x = ring("x")
-
-    val (gcd, s, t) = PolynomialExtendedGCD(1 + x + x.pow(2) + x.pow(3), 1 + 2 * x + 9 * x.pow(2)).tuple3
-
-    println(s)
-    println(t)
-    println(gcd)
-  }
 }
\ No newline at end of file
diff --git a/rings/pom.xml b/rings/pom.xml
index 0b5f9ab..e8f8b5b 100644
--- a/rings/pom.xml
+++ b/rings/pom.xml
@@ -7,6 +7,12 @@
     <groupId>cc.redberry</groupId>
     <artifactId>rings</artifactId>
     <version>2.0</version>
+    <packaging>jar</packaging>
+    <name>rings</name>
+    <url>https://github.com/PoslavskySV/rings/</url>
+    <description>
+        Rings: efficient Java/Scala library for polynomial rings
+    </description>
 
     <parent>
         <groupId>org.sonatype.oss</groupId>
@@ -15,6 +21,34 @@
         <relativePath/>
     </parent>
 
+    <licenses>
+        <license>
+            <name>Apache License, Version 2.0</name>
+            <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <developers>
+        <developer>
+            <id>PoslavskySV</id>
+            <email>stvlpos@mail.ru</email>
+            <name>Stanislav Poslavsky</name>
+            <roles>
+                <role>architect</role>
+                <role>developer</role>
+                <role>tester</role>
+                <role>documentation</role>
+            </roles>
+            <timezone>UTC+04:00</timezone>
+            <url>https://github.com/PoslavskySV</url>
+        </developer>
+    </developers>
+
+    <scm>
+        <connection>scm:git:https://github.com/PoslavskySV/rings.git</connection>
+    </scm>
+
     <build>
         <plugins>
             <plugin>
diff --git a/rings/src/main/java/cc/redberry/rings/Ring.java b/rings/src/main/java/cc/redberry/rings/Ring.java
index d7e7f41..ed80524 100644
--- a/rings/src/main/java/cc/redberry/rings/Ring.java
+++ b/rings/src/main/java/cc/redberry/rings/Ring.java
@@ -105,6 +105,7 @@ default boolean isFiniteField() {
      * @param elements elements to sum
      * @return sum of the array
      */
+    @SuppressWarnings("unchecked")
     default E add(E... elements) {
         E r = elements[0];
         for (int i = 1; i < elements.length; i++)
@@ -156,6 +157,7 @@ default E decrement(E element) {
      * @param elements the elements
      * @return product of the array
      */
+    @SuppressWarnings("unchecked")
     default E multiply(E... elements) {
         E r = elements[0];
         for (int i = 1; i < elements.length; i++)
@@ -326,6 +328,7 @@ default E lcm(E a, E b) {
      * @param elements the elements
      * @return gcd
      */
+    @SuppressWarnings("unchecked")
     default E gcd(E... elements) {
         return gcd(Arrays.asList(elements));
     }
diff --git a/rings/src/main/java/cc/redberry/rings/poly/univar/UnivariatePolynomial.java b/rings/src/main/java/cc/redberry/rings/poly/univar/UnivariatePolynomial.java
index 55ffc11..cff83e1 100644
--- a/rings/src/main/java/cc/redberry/rings/poly/univar/UnivariatePolynomial.java
+++ b/rings/src/main/java/cc/redberry/rings/poly/univar/UnivariatePolynomial.java
@@ -60,6 +60,7 @@ public static <E> UnivariatePolynomial<E> parse(String string, Ring<E> ring) {
      * @param data the coefficients
      * @return new univariate polynomial over specified ring with specified coefficients
      */
+    @SuppressWarnings("unchecked")
     public static <E> UnivariatePolynomial<E> create(Ring<E> ring, E... data) {
         ring.setToValueOf(data);
         return new UnivariatePolynomial<>(ring, data);