'org.webjars:bootstrap:4.0.0-alpha'
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>4.0.0-alpha</version>
</dependency>
<dependency org="org.webjars" name="bootstrap" rev="4.0.0-alpha"/>
"org.webjars", "bootstrap", "4.0.0-alpha"