Sizhuk A, Yezhov S. Derivation of a Model Hamiltonian in the “Short Time Scale” Limit. Ukr. J. Phys. [Internet]. 2012 Jun. 30 [cited 2025 Apr. 24];57(6):670. Available from: https://ujp.bitp.kiev.ua/index.php/ukl/article/view/2021252