TY  - BOOK
AU  - Alchourron,Carlos E.
AU  - Bulygin,Eugenio
TI  - Normative systems
SN  - 0387810196 :
U1  - 340.018 
PY  - 1971///
CY  - New York
PB  - Springer-Verlag
KW  - Law
KW  - Methodology
KW  - Logic, Symbolic and mathematical
N1  - Includes bibliographical references and index
ER  -