@inproceedings{POPL-1998-NipkowO,
	author        = "Tobias Nipkow and David von Oheimb",
	booktitle     = "{Proceedings of the 25th Symposium on Principles of Programming Languages}",
	doi           = "10.1145/268946.268960",
	editor        = "David B. MacQueen and Luca Cardelli",
	isbn          = "0-89791-979-3",
	pages         = "161--170",
	publisher     = "{ACM}",
	title         = "{Java\emph{None} is Type-Safe — Definitely}",
	year          = 1998,
}