Ратушний, Р.Т., Сидорчук, О.О. and Босак, В.В. 2012. System-factorial principles of creation of conceptual model of the product. Eastern-European Journal of Enterprise Technologies. 1, 13(55) (Feb. 2012), 30–32. DOI:https://doi.org/10.15587/1729-4061.2012.3644.