Roberto Salvati and Ira D.Sasow sky,Development of collapse sinkholes in areas of groundwater discharge Journal of Hrology,Volume 264,Issues 1-4,30 July 2002,Pages 1-11.
S.K.Samanta,Fuzzy nearness structure Fuzzy Sets and Systems,Volume 44,Issue 2,25 November 1991,Pages 295-302.
[8]
Mark Burgin and Martin Kalina,Fuzzy conditional convergence and nearness relations,Fuzzy Sets and Systems,Volume 149,Issue 3,1 February 2005,Pages 383-398
[9]
Vladmir Janis,Resemblance is a nearness,Fuzzy Sets and Systems,Volume 133,Issue 2,16 January 2003,Pages 171-173.