Shyshchak, Olena     VIIth international scientific-technical conference "Advance in petroleum and gas industry and petrochemistry" (APGIP-7) [Текст] / Olena Shyshchak // Chemistry & Chemical Technology / Lviv Polytechnic Nat. Univ. ; ed.-in-chief M. Bratychak. — Lviv : Publ. House of Lviv Polytechnic Nat. Univ., 2014. — P. I-II.