1. A fuzzy algorithmic approach to the definition of complex or imprecise concepts;Zadeh;Electronics Research Laboratory, memorandum n°ERL-M474,1974
2. Graphs and Questionnaires;Picard,1980
3. An application of the theory of questionnaires to information theory;Bouchon,1975
4. Length of fuzzy questionnaires;Bouchon,1978
5. Application d'une mesure d'information à la construction de questionnaires flous;Bouchon,1977