For citations:

Vorobiev A.M., Bagmutov A.S., Popov A.I. On formal asymptotic expansion of resonance for quantum waveguide with perforated semitransparent barrier. Nanosystems: Physics, Chemistry, Mathematics. 2019;10(4):415–419. https://doi.org/10.17586/2220-8054-2019-10-4-415-419