<dependency>
  <groupId>org.webjars.bower</groupId>
  <artifactId>bootstrap</artifactId>
  <version>4.0.0-alpha.5</version>
</dependency>

implementation 'org.webjars.bower:bootstrap:4.0.0-alpha.5'

implementation("org.webjars.bower:bootstrap:4.0.0-alpha.5")

libraryDependencies += "org.webjars.bower" % "bootstrap" % "4.0.0-alpha.5"

@Grapes(
  @Grab(group='org.webjars.bower', module='bootstrap', version='4.0.0-alpha.5')
)

<dependency org="org.webjars.bower" name="bootstrap" rev="4.0.0-alpha.5" />

[org.webjars.bower/bootstrap "4.0.0-alpha.5"]

'org.webjars.bower:bootstrap:jar:4.0.0-alpha.5'