BibTeX: |
@article{HotelKeyCards-AFP,
author = {Tobias Nipkow},
title = {Hotel Key Card System},
journal = {Archive of Formal Proofs},
month = sep,
year = 2006,
note = {\url{http://isa-afp.org/entries/HotelKeyCards.html},
Formal proof development},
ISSN = {2150-914x},
}
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