6Joseph F, Polph E, Ronal L, et al. Multivariate data analysis with readings. New jersey: prentice-Hall International, INC 1995, 556-615.
7Luce D, Tukey J. Simultaneoua conjoint measurement: A new type of fundamental measurement. J math psychol. 1964.153-170.
8Anderson N. Functional measurement and psycho- physical Judgement. lbsychol rev 1977, 77:153-- 170.
9McFadden D. Conditional logit analysis of qualitative choice behaviour. Berke-ley. CA: university of California at Berkeley.1973. (working paper No 1991BART 10).
10Ryan M. Using conjoint analysis to go beyondheakh outcomes: an application to in vitro fertilization. Soc Sci Med 1998, 8:535-546.