1) Harry M. Hersh and Alfonso Caramazza
A fuzzy set approach to modifiers and vagueness in natural language
Journal of Experimental Psychology: General, Volume 105, Issue 3, September 1976, Pages 254-276
ссылка1
2) H. -J. Zimmermann and P. Zysno
Quantifying vagueness in decision models
European Journal of Operational Research, Volume 22, Issue 2, November 1985, Pages 148-158
ссылка2
3) Zdzisław Pawlak and Andrzej Skowron
Rudiments of rough sets
Information Sciences, Volume 177, Issue 1, 1 January 2007, Pages 3-27
ссылка3
4) Zdzisław Pawlak and Andrzej Skowron
Rough sets: Some extensions
Information Sciences, Volume 177, Issue 1, 1 January 2007, Pages 28-40
ссылка4
5) Zdzisław Pawlak and Andrzej Skowron
Rough sets and Boolean reasoning
Information Sciences, Volume 177, Issue 1, 1 January 2007, Pages 41-73
ссылка5
Спасибо.