TY  - JOUR
T1  - Additive and multiplicative models of the voting universe: The case of Pennsylvania 1960-1968
AU  - Burnham, Walter Dean
AU  - Sprague, John
PY  - 1970
SP  - 471
EP  - 490
JO  - American Political Science Review
VL  - 64
IS  - 2
SN  - 0003-0554
UR  - http://www.jstor.org/stable/1953844
ER  -