Petrov, Ilia Andreevich, and Evgeniy Vladimirovich Slavnov. “Modeling of Flow in an Extruder With Radial Clearance As a Distributed Feedback System Described by a Delay Differential Equation”. Computational Continuum Mechanics, vol. 5, no. 1, May 2012, pp. 107-13, https://doi.org/10.7242/1999-6691/2012.5.1.13.