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Mathematical Biosciences > 2017 > 292 > C > 10-17
Acta Mathematica Scientia > 2014 > 34 > 5 > 1417-1426
Mathematica Slovaca > 2010 > 60 > 1 > 75-82
Mathematical Biosciences > 2017 > 292 > C > 10-17
Acta Mathematica Scientia > 2014 > 34 > 5 > 1417-1426
Mathematica Slovaca > 2010 > 60 > 1 > 75-82