Sarsembek, S.S., Mussabek, G.K., Dikhanbaev, K.К., Ermukhamed, D., Baiganatova, Sh.B., AND Amirkhanova, G.A.. " Тhe production of porous gallium phosphide films and the investigation of physical properties" Recent Contributions to Physics (Rec.Contr.Phys.) [Online], Volume 67 Number 4 (30 October 2018)