“…Among the problems which have attracted attention, let us mention spectral enclosure results and bounds on the number of complex eigenvalues [1,5,11,16,20,23,27]. Another active area of interest is nonself-adjoint generalisations of Lieb-Thirring inequalities for Schrödinger operators L. Golinskii and A. Stepanenko 1346 [4,6,12,17,19,22,26,37], as well as for other types of operators [9,[13][14][15]38]. Still, many questions remain unanswered.…”