Пилипака, С., & Муквич, М. (2014). THE ANALYTICAL DESCRIPTION OF A TUBULAR SURFACE, REFERRED TO LINES OF CURVATURE, IN SYSTEM OF THE ACCOMPANYING THREE-EDGE OF A SLOPE CURVE. Сучасні проблеми моделювання, (3). вилучено із http://magazine.mdpu.org.ua/index.php/spm/article/view/1138