This publication is cited in the following articles:
A. S. Kostenko, M. M. Malamud, “Ob odnomernom operatore Shredingera s $\delta$-vzaimodeistviyami”, Funkts. analiz i ego pril., 44:2 (2010), 87–91
V. A. Mikhailets, “The Structure of the Continuous Spectrum of a One-Dimensional Schrödinger Operator with Point Interactions”, Funct. Anal. Appl., 30:2 (1996), 144–146