Weighting patterns and the controllability and observability of time-variable 2D continuous-discrete linear systems. Prepeliţă, V.; Pîrvan, M.; Giurcanu, M. — 2001 Balkan Journal of Geometry and its Applications (BJGA)
Peano Baker series convergence for matrix-valued functions of bounded variation. Prepeliţă, V.; Doroftei, M.; Vasilache, T. — 1998 Balkan Journal of Geometry and its Applications (BJGA)