On the Farey fractions with denominators in arithmetic progression. Cobeli, C.; Zaharescu, A. — 2006 Journal of Integer Sequences [electronic only]
A class of algebraic-exponential congruences modulo p . Cobeli, C.; Vâjâitu, M.; Zaharescu, A. — 2002 Acta Mathematica Universitatis Comenianae. New Series
Generalization of a theorem of Steinhaus C. Cobeli; G. Groza; M. Vâjâitu; A. Zaharescu — 2002 Colloquium Mathematicae We present a multidimensional version of the Three Gap Theorem of Steinhaus, proving that the number of the so-called primitive arcs is bounded in any dimension.