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2. A.E. McDonald, O. Baker, A method of calculating multiphase flow in pipelines using rubber spheres to control liquid Holdup, Drill. Prod Prac. API 56, 1964
3. S. Barua, An experimental verification and modification of the McDonald and Baker pigging model for horizontal flow. Ph.D. Thesis, Univ. of Tulsa, Texas, 1982
4. K. Kohda, Y. Suzukawa, H. Furukwa, Pigging analysis for gas-liquid two-phase flow in pipelines, ASME Annual Energy-Resources Technology Conference and Exhibition, New Orleans, 1998