id: 50286799 dt: j an: 50286799 au: Höhle, Ulrich ti: Fuzzy sets and sheaves. Part I: Basic concepts so: Fuzzy Sets and Systems 158, No. 11, 1143-1174 (2007). py: 2007 pu: la: EN cc: ut: ci: li: doi:10.1016/j.fss.2006.12.009