Abstract: We review a work of V. Geyler on the spectrum
of a two-dimensional magnetic Schroedinger operator with a
periodic system of point interactions
(see Algebra i analiz 3
(1991), No. 3; English translation entitled The two-dimensional
Schroedinger operator with a uniform magnetic field, and its perturbation
by periodic zero-range potentials appeared in St. Petersburg
Math. J. 3 (1992), 489-532).
