TY  - BOOK
AU  - Vopenka,Petr
AU  - Hajek,Petr
TI  - The theory of semisets
SN  - 0720422671 :
U1  - 511.3 
PY  - 1972///
CY  - Amsterdam
PB  - North Holland
KW  - Set theory
N1  - Includes bibliographical references and index
ER  -