- Stephen D. Brookes, Achim Jung, Michael W. Mislove, Andre Scedrov, editors, Fifteenth Conference on Mathematical Foundations of Progamming Semantics, MFPS 1999, Tulane University, New Orleans, LA, USA, April 28 - May 1, 1999. Volume 20 of Electronic Notes in Theoretical Computer Science, Elsevier, 1999.