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São Paulo Journal of Mathematical Sciences > 2015 > 9 > 2 > 141-145
Hydrogeology Journal > 2015 > 23 > 4 > 687-705
Hydrogeology Journal > 2012 > 20 > 7 > 1223-1238
New Forests > 2008 > 35 > 3 > 285-298
Bulletin of the Brazilian Mathematical Society, New Series > 2002 > 33 > 1 > 99-123