1. V. Feshin, Nature of Coordination Bonds in Compounds of Group 14 Elements (LAMBERT Academic Publishing, Saarbrücken, 2018).
2. V. P. Feshin, Problems of Coordination Compounds of Group IVA Elements according to NQR and Quantum-Chemical Data (UrO RAN, Perm, 2015) [in Russian].
3. A. A. Korlyukov, Russ. Chem. Rev. 84, 422 (2015).
https://doi.org/10.1070/RCR4466
4. A. A. Nikolin and V. V. Negrebecky, Russ. Chem. Rev. 83, 848 (2014).
https://doi.org/10.1070/RC2014v083n09ABEH004385
5. E. A. Kravchenko, N. T. Kuznetsov, and V. M. Novotortsev, Nuclear Quadrupole Resonance in Coordination Chemistry (Krasand, Moscow, 2013) [in Russian].