This publication is cited in the following articles:
V. P. Poplevko, E. A. Lutkovskaya, E. V. Tuchnolobova, “Printsip maksimuma dlya zadachi optimalnogo upravleniya teplovym protsessom”, Izvestiya Irkutskogo gosudarstvennogo universiteta. Seriya Matematika, 6:3 (2013), 117–123