TY  - BOOK
AU  - Papper, Karl R
TI  - Conjectures and refutations: the growth of scientific knowledge
U1  - 121 21st
PY  - 1963///
CY  - London
PB  - Routledge and Kegan Paul
KW  - Philosophey; Prediction (Logic); Refutation (Logic)
ER  -