For citations:

Sabirov K.K., Aminov U.A., Saparov Kh.Sh., Karimov M.K., Abdikarimov Kh. The Green function for simplest quantum graphs. Nanosystems: Physics, Chemistry, Mathematics. 2015;6(6):762-766. https://doi.org/10.17586/2220-8054-2015-6-6-762-766