By Goldstein G.R.   Goldstein J.A.   Ames S.W.F.   in Journal of Mathematical Analysis and Applications

ISSN:0022-247X|226|2|393-413

Academic Press‎(1998)‎

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By Favini A.   Goldstein G. R.   Goldstein J. A.   Romanelli S.   in Mathematical Modelling of Natural Phenomena 

ISSN:0973-5348|3|7|143-147

Edp Sciences‎(2008)‎

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