Staňák, Peter, Vladimír Sládek, Ján Sládek, Slavomír Krahulec, and Ladislav Sátor. 2013. “Application of Patch Test in Meshless Analysis of Continuously Non-Homogeneous Piezoelectric Circular Plate”. Applied and Computational Mechanics 7 (1). https://acm.kme.zcu.cz//article/view/191.