Axmadjonov, S. “GENERALIZATION OF THE RIEMANN METHOD FOR SOLVING THE PROBLEM OF WAVE PROPAGATION IN A SEMI-INFINITE GAS PIPELINE BY A QUADRATIC”. Acta of Turin Polytechnic University in Tashkent, vol. 11, no. 2, June 2021, pp. 25-31, https://acta.polito.uz/index.php/journal/article/view/54.