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第1期关于非强不可约的Heogaard分解······、·‘····························,·············……雷逢春(l)可定向把体中的seifert曲面与偶曲线组····································?
Issue 1 About Heogaard Decomposition of Non-strongly Irreducible · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·············································································································································· ·················· ····