Petrov, Iliya Andreevich, and Evgeniy Vladimirovich Slavnov. “Model of Leakages through Radial Clearences in a Single Screw Extruder With Linearly Changing Geometry of Screw”. Computational Continuum Mechanics, vol. 5, no. 4, Dec. 2012, pp. 461-8, https://doi.org/10.7242/1999-6691/2012.5.4.54.