'com.foursquare:quadtree_2.11:0.1a'
<dependency>
<groupId>com.foursquare</groupId>
<artifactId>quadtree_2.11</artifactId>
<version>0.1a</version>
</dependency>
<dependency org="com.foursquare" name="quadtree_2.11" rev="0.1a"/>
"com.foursquare", "quadtree_2.11", "0.1a"