AndrukМ. S., and V. S. Voshchynskyi. “THE MATHEMATICAL MODEL OF HERMETICITY PNEUMATIC SYSTEM IN INSTALLATIONS OF THE FIELD WITH REFERENCE GAS METERS”. METHODS AND DEVICES OF QUALITY CONTROL0, no. 2(41) (December 1, 2018): 92-99. Accessed July 23, 2019. http://mpky.nung.edu.ua/index.php/mpky/article/view/466.