Omsk: Publishing House of Omsk State Technical University, 2014. — 212 s. — ISBN 978-5-8149-1703-4 . Mathematical models describing the working process of gas turbine engines. An equation was derived that allowed to close the mathematical model of the working process of gas turbine engines . Scientific-methodical and information materials on the closed mathematical model of a two-circuit turbojet engine, as well as methods of calculating the initial mode, throttle, high-speed and climatic characteristics ., compiled on their basis, are presented. Addressed to designers, graduate students engaged in the study of the working process of gas turbine engines, as well as students studying in the specialty "Aviation engines and power plants" .