A relative variant of the Morse theory. (English. Russian original) Zbl 1267.58009
Russ. Math. 57, No. 1, 17-25 (2013); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 2013, No. 1, 21-30 (2013).
Reviewer: Teodora-Liliana Rădulescu (Craiova)