TY  - BOOK
AU  - Symposium held in Berlin, 14-19 August,1967
AU  - Flachsmeyer, J., ed.
AU  - Poppe, H., ed.
AU  - Terpe, F., ed.
TI  - Contributions to extension theory of topological structures - Proceedings
U1  - 514 
PY  - 1969///
CY  - New York
PB  - Academic Press
ER  -