Kushniretska, Oksana     The ortological model of knowledgeof scientific and technical information system [Текст] / Oksana Kushniretska, Irina Kushniretska, Andriy Berko // Computer science and information technologies CSIT 2014 : proc. of the IX Intern. sci. and techn. conf., Nov. 18-22, 2014, Lviv, Ukraine / Min. of Education and Science of Ukraine, Lviv Politechniс Nat. Univ. — Lviv : Publ. Lviv Politechniс, 2014. — P. 47-48.