Maksymjuk, S.O. and Karpash, O.M. 2020. The gas-pipelines technical state diagnostics methods diversification in conditions of the natural gas quality estimation system development using the principles of EU. METHODS AND DEVICES OF QUALITY CONTROL. 2(45) (Dec. 2020), 82–89. DOI:https://doi.org/10.31471/1993-9981-2020-2(45)-82-89.