Analytical model of oil pipeline overground transitions, laid in mountain areasAndriy S. Velychkovych, Andriy V. Andrusyak, Tetiana O. Pryhorovska and Liubomyr Y. RopyakOil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 74 (2019) 65DOI: https://doi.org/10.2516/ogst/2019039