Authors
Małgorzata Graczyk
malgorzata.graczyk@up.poznan.pl
Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Poznań, Poland
Bronisław Ceranka
bronislaw.ceranka@up.poznan.pl
Department of Mathematical and Statistical Methods, Poznań University of Life Sciences, Poznań, Poland
Teresa Oliveira
Department of Mathematical and Statistical Methods, Universidade Aberta, Lisboa, Portugal