KTITOROV, S. A., & PETROV, Y. V. (1991). Supersymmetry and the 2D electron density of states problem for-impurity systems in a strong magnetic field. ФІЗИКА НИЗЬКИХ ТЕМПЕРАТУР, 17(9), 1127–1130. вилучено із https://fnt.ilt.kharkiv.ua/index.php/fnt/article/view/f17-1127e