TY  - BOOK
AU  - Popper, Karl R. 
TI  - Conjectures and refutations : : the growth if scientific knowledge / 
AV  - Q171 P67 1963
PY  - 1963///
CY  - London ; 
PB  - Routledge and Kegan paul, 
KW  - Ciencia
KW  - Filosofía
ER  -