“Flow Modelling in a Straight Rigid-Walled Duct With Two Rectangular Axisymmetric Narrowings. Part 2. An Alternative Approach”. 2021. Bulletin of V.N. Karazin Kharkiv National University, Series «Mathematical Modeling. Information Technology. Automated Control Systems» 51 (October): 18-35. https://doi.org/10.26565/2304-6201-2021-51-03.