机构:
Adam Mickiewicz Univ, Fac Math & Comp Sci, Ul Umultowska 87, PL-61614 Poznan, PolandAdam Mickiewicz Univ, Fac Math & Comp Sci, Ul Umultowska 87, PL-61614 Poznan, Poland
机构:
FREE UNIV BERLIN,FACHBEREICH MATH 3,INST MATH,D-1000 BERLIN 33,FED REP GERFREE UNIV BERLIN,FACHBEREICH MATH 3,INST MATH,D-1000 BERLIN 33,FED REP GER