1. Ya. O. Tokaichuk, Synthesis, Structure, and Properties of New Compounds of Gallium with p -Elements of the IV Group and Rare-Earth Metals of the Cerium Group [in Ukrainian], Author’s Abstract of Candidate-Degree Thesis (Chem.), Lviv (2004).
2. Ya. O. Tokajchuk, A. A. Fedorchuk, and I. R. Mokra, “Interaction among the components in La–Ga–Si system at 870 K,” Pol. J. Chem., 74, 745–748 (2000).
3. Ya. Tokaichuk, A. Fedorchuk, I. Mokra, and O. Bodak, “Ternary Ce–Ga–Si system at 870 K,” in: Bulletin of Lviv University, Ser. Chem. [in Ukrainian], Issue 41 (2002), pp. 40–45.
4. Ya. O. Tokaichuk, A. A. Fedorchuk, and I. R. Mokra, “Ternary Pr–Ga–Si system,” in: Bulletin of Lviv University, Ser. Chem. [in Ukrainian], Issue 39 (2000), pp. 25–29.
5. Ya. O. Tokaychuk, A. O. Fedorchuk, O. I. Bodak, and I. R. Mokra, “Phase relations in the Nd–Ga–Si system at 870 K,” J. Alloys Compd., 367, 64–69 (2004).