PA Velmisov, Y. Pokladova Differential Calculus functions of several variables-П.А. Вельмисов, Ю.В. Покладова Дифференциальное исчисление функций нескольких переменных

PA Velmisov, Y. Pokladova - Differential calculus functions of several variables   MINISTRY OF EDUCATION AND SCIENCE OF THE RUSSIAN FEDERATION Federal State Educational Institution Higher Professional Education "Ulyanovsk State Technical University".

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http://venec.ulstu.ru/lib/disk/2012/Velmisov4.pdf