00818nam0-22002651i-450-990001183540403321000118354FED01000118354(Aleph)000118354FED0100011835420000920d1974----km-y0itay50------baengUniversal Extensions and One Dimensional Crystalline Cohomologyby MAZUR and MESSIN G W.Berlin [etc.]Springer-Verlag1974Lecture Notes in Mathematics370Mazur,Barrry346508Messing,WilliamITUNINARICAUNIMARCBK990001183540403321C-20-(37014995MA1MA1Universal Extensions and One Dimensional Crystalline Cohomology342336UNINAING01