Karkulovskyy, Bogdan     Architecture of educational cad system [Текст] / Bogdan Karkulovskyy, Volodymyr Karkulovskyy, Vasyl Teslyuk // CAD in machinery design - implementation and educational issues CADMD 2013 : proc. of the XXI Pol.-ukr. conf., Okt. 11-12, 2013, Lancut, Poland / Warsaw. Univ. of Technology, Lviv Politechniс Nat. Univ. — Warsaw, 2013. — P. 17-18.