TY  - BOOK
AU  - Lancaster Kelvin
TI  - Variety, equity efficiency :  Product variety in an   
SN  - 0 631 11411 4
U1  - X:511, L9 
PY  - 1979///
CY  - Oxford
PB  - Basil Blackwell         
KW  - Marketing Survey
N1  - Bibliography p 363-68; Appendix p 335-49
ER  -