J. Joseph Fowler, Stephen G. Kobourov. Characterization of Unlabeled Level Planar Graphs. In Seok-Hee Hong, Takao Nishizeki, Wu Quan, editors, Graph Drawing, 15th International Symposium, GD 2007, Sydney, Australia, September 24-26, 2007. Revised Papers. Volume 4875 of Lecture Notes in Computer Science, pages 37-49, Springer, 2007. [doi]
Abstract is missing.