TY JOUR TI Investigation of liquid product optimal heating problem with a liquid coolant in a jacketed tank KW optimal control KW optimal heating control KW Pontryagin maximum principle KW calculus of variations JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Istomin, A.. AU Kobozev, V.. AU Krivov, M.. AU Kolmogorov, A.. PY 2025 IS 2025 PB Astrakhan State Technical University