DUTA, A., I.- D. GEONEA, G. DJUKANOVIC, M. POPESCU, and L. SASS. “ASPECTS AND GEOMETRIC INTERPRETATION IN SOLVING CONICAL SECTIONS”. Journal of Industrial Design and Engineering Graphics, Vol. 14, no. 1, May 2019, pp. 23-26, http://sorging.ro/jideg/index.php/jid/article/view/419.