Oliinyk, A. P., Grigorchuk, G. V., & Govdyak, R. M. (2019). THE MATHEMATICAL MODELLING METHODS APPLYING TO ESTIMATE THE PIPELINES TECHNICAL STATE AND ENVIRONMENT SITUATION. METHODS AND DEVICES OF QUALITY CONTROL, (1(42), 97–103. https://doi.org/10.31471/1993-9981-2019-1(42)-97-103