TY  - BOOK
AU  - Heidelberg , A.D/ Eckmann , B.Z. / Maclane, S.
TI  - Lecture notes in mathematics : 61 a collection of informal reports and seminars : Reports of the midwest ; category seminar 
AV  - QA 8 . L2 1968 
PY  - 1968///
CY  - Berlin
PB  - Spinger
KW  - mathematics - periodicals
KW  - mathematics - study and techines
ER  -