Comment on Tunneling effect on second-harmonic generation in quantum dot molecule, Superlattices and Microstructures 91 (2016) 358-364

A comment about the paper Tunneling effect on second-harmonic generation in quantum dot molecule, Superlattices and Microstructures 91 (2016) 358-364 is provided. It is shown that the formula used by the authors for the study of the second-harmonic generation coefficient cannot apply in the system under study. Therefore, the results of the paper are incorrect.