<dependency>
  <groupId>org.slf4j13</groupId>
  <artifactId>slf4j-log4j13</artifactId>
  <version>1.0-beta9</version>
</dependency>

implementation 'org.slf4j13:slf4j-log4j13:1.0-beta9'

implementation("org.slf4j13:slf4j-log4j13:1.0-beta9")

libraryDependencies += "org.slf4j13" % "slf4j-log4j13" % "1.0-beta9"

@Grapes(
  @Grab(group='org.slf4j13', module='slf4j-log4j13', version='1.0-beta9')
)

<dependency org="org.slf4j13" name="slf4j-log4j13" rev="1.0-beta9" />

[org.slf4j13/slf4j-log4j13 "1.0-beta9"]

'org.slf4j13:slf4j-log4j13:jar:1.0-beta9'