Un

<dependency>
    <groupId>rubygems</groupId>
    <artifactId>un</artifactId>
    <version>0.2.0</version>
</dependency>

compile group: 'rubygems', name: 'un', version: '0.2.0'

compile 'rubygems:un:0.2.0'

libraryDependencies += "rubygems" % "un" % "0.2.0"

<dependency org="rubygems" name="un" rev="0.2.0"/>

@Grapes(
            @Grab(group='rubygems', module='un', version='0.2.0')
        )

[rubygems/un "0.2.0"]

'rubygems:un:jar:0.2.0'