TY  - BOOK
AU  - Leeftang P S H
TI  - Mathematical models in marketing:  A survey the sta   
SN  - 90.207.0436.2
U1  - X:51:(B), L4 
PY  - 1974///
CY  - Leiden
PB  - Kroese          
KW  - Marketing IRT Mathematics
N1  - Bibliography p 204-09; Appendix chapterwise
ER  -