Nils Klarlund. An ::::n:::: log ::::n:::: Algorithm for Online BDD Refinement. In Orna Grumberg, editor, Computer Aided Verification, 9th International Conference, CAV 97, Haifa, Israel, June 22-25, 1997, Proceedings. Volume 1254 of Lecture Notes in Computer Science, pages 107-118, Springer, 1997.