TY  - BOOK
AU  - Sarkar,Sandipana
TI  - Negation and negative facts : their indispensability / 
U1  - 160 
PY  - 2002///
CY  - Kolkata : 
PB  - Indiana , 
KW  - NEGATION-LOGIC
N1  - Includes bibliographical references and index
ER  -