Мокійчук, Валентин, and Ольга Самойліченко. “VALADATION OF ANALYTICAL PROCEDURES AS INTEGRAL PART OF TESTING RESULTS QUALITY ASSURANCE”. Electrotechnic and Computer Systems, no. 6(82) (February 21, 2019): 228-234. Accessed July 14, 2020. http://eltecs.opu.ua/index.php/journal/article/view/1141.