Normal semi-invariant submanifolds of a Sasakian manifold A. Bejancu; N. Papaghiuc — 1983 Matematički Vesnik
A geometric characterization of Finsler manifolds of constant curvature K = 1 . Bejancu, A.; Farran, H.R. — 2000 International Journal of Mathematics and Mathematical Sciences
Real hypersurfaces of indefinite Kähler manifolds. Bejancu, A.; Duggal, K.L. — 1993 International Journal of Mathematics and Mathematical Sciences