TY  - BOOK
AU  - ABRAHAM A FRAENKEL
TI  - EXTENSION OF THE NUMBER -CONCEPT
U1  - GN512.81F845E 
PY  - 1964///
CY  - NEW YORK
PB  - SCRIPTA MATHEMATICA
KW  - EXTENSION OF THE NUMBER -CONCEPT
N1  - MOERN BOOK HOUSE
ER  -