Simplifying biochemical tumorous bone remodeling models through variable order derivatives. - Joana P. Neto 002; Rui Moura Coelho; Duarte Valério; Susana Vinga; Dominik Sierociuk; Wiktor Malesza; Michal Macias; Andrzej Dzielinski (Comput. Math. Appl., 2018)