<dependency>
  <groupId>com.squareup.mortar</groupId>
  <artifactId>mortar</artifactId>
  <version>0.20</version>
</dependency>

implementation 'com.squareup.mortar:mortar:0.20'

implementation("com.squareup.mortar:mortar:0.20")

libraryDependencies += "com.squareup.mortar" % "mortar" % "0.20"

@Grapes(
  @Grab(group='com.squareup.mortar', module='mortar', version='0.20')
)

<dependency org="com.squareup.mortar" name="mortar" rev="0.20" />

[com.squareup.mortar/mortar "0.20"]

'com.squareup.mortar:mortar:jar:0.20'