@article{DBLP:journals/fuin/Blikle91,
author = {Andrzej Blikle},
title = {Three-valued predicates for software specification and validation},
journal = {Fundam. Inform.},
volume = {14},
number = {4},
year = {1991},
pages = {387-410},
bibsource = {DBLP, http://dblp.uni-trier.de}
}