Staircase Join: Teach a Relational DBMS to Watch its (Axis) Steps.

http://www.vldb.org/conf/2003/papers/S16P03.pdf Torsten Grust Maurice van Keulen Jens Teubner Staircase Join: Teach a Relational DBMS to Watch its (Axis) Steps. 2003 VLDB db/conf/vldb/vldb2003.html#GrustKT03 524-525