TY  - DATA
AU  - Hempel, John
TI  - Intersection calculus on surfaces with applications to 3-manifolds 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9781470406929 (online)
PY  - 1983///
CY  - Providence, R.I., USA
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0282
ER  -