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Demonstratio Mathematica > 2021 > Vol. 54, nr 1 > 474--487
Demonstratio Mathematica > 2019 > Vol. 52, nr 1 > 428--436
Demonstratio Mathematica > 2019 > Vol. 52, nr 1 > 388--396
Demonstratio Mathematica > 2017 > Vol. 50, nr 1 > 190--207
Demonstratio Mathematica > 2016 > Vol. 49, nr 3 > 345--356
Journal of Mathematics and Applications > 2016 > Vol. 39 > 81--90
Demonstratio Mathematica > 2015 > Vol. 48, nr 3 > 440--451
Journal of Mathematics and Applications > 2015 > Vol. 38 > 133--150
Journal of Mathematics and Applications > 2015 > Vol. 38 > 151--169
Demonstratio Mathematica > 2014 > Vol. 47, nr 4 > 971--978
Demonstratio Mathematica > 2013 > Vol. 46, nr 1 > 181--190
Demonstratio Mathematica > 2013 > Vol. 46, nr 4 > 757--780
Demonstratio Mathematica > 2013 > Vol. 46, nr 1 > 191--196
Journal of Mathematics and Applications > 2013 > Vol. 36 > 95--111
Demonstratio Mathematica > 2011 > Vol. 44, nr 2 > 349--357
Fasciculi Mathematici > 2010 > Nr 45 > 121-131
Fasciculi Mathematici > 2010 > Nr 45 > 5-12
Fasciculi Mathematici > 2010 > Nr 43 > 33-43