TY  - DATA
AU  - Moerdijk, Ieke.
AU  - Vermeulen, J. J. C.
TI  - Proper maps of toposes 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470402969 (online)
PY  - 2000///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0705
ER  -