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Mathematical Sciences > 2015 > 9 > 2 > 59-69
Results in Mathematics > 2013 > 63 > 1-2 > 15-30
Advances in Difference Equations > 2011 > 2011 > 1 > 1-16
Opuscula Mathematica > 2011 > Vol. 31, no. 3 > 443-455
Computers and Mathematics with Applications > 2010 > 59 > 1 > 64-73
Semigroup Forum > 2009 > 79 > 3 > 507-514
Journal of Fixed Point Theory and Applications > 2009 > 5 > 1 > 129-144
Computers and Mathematics with Applications > 2004 > 47 > 6-7 > 863-875