Semi-empirical method for estimation of energy losses in a large-scale pipelineLaanearu, Janek; Annus, Ivar; Sergejeva, Monika; Koppel, TiitProcedia engineering2014 / p. 969-977 : ill https://doi.org/10.1016/j.proeng.2014.02.108 Conference Proceedings at Scopus Article at Scopus Article at WOS