Dubrovskyi I, Bucharskyi V. Statement of the problem of designing a liquid rocket engine dual bell nozzle of the maximum thrust using the direct method of the calculus of variations. Chall. issue mod. sci. [Internet]. 2023 Jun. 6 [cited 2024 Dec. 22];1:22-8. Available from: https://cims.fti.dp.ua/j/article/view/6