TY  - DATA
AU  - B. Mazur
AU  -  W. Messing
TI  - Universal Extensions and One Dimensional Crystalline Cohomology
T2  - Lecture Notes in Mathematics
SN  - 9783540379331
PY  - 1974///
CY  - Heidelberg
PB  - Springer Berlin
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/BFb0061628
ER  -