Toru Hasunuma, Toshimasa Ishii, Hirotaka Ono, Yushi Uno. A Linear Time Algorithm for ::::L::::(2, 1)-Labeling of Trees. In Amos Fiat, Peter Sanders, editors, Algorithms - ESA 2009, 17th Annual European Symposium, Copenhagen, Denmark, September 7-9, 2009. Proceedings. Volume 5757 of Lecture Notes in Computer Science, pages 35-46, Springer, 2009. [doi]
Abstract is missing.