The Jacobi fields for a spray on the tangent bundle. Bucataru, Ioan — 1999 Novi Sad Journal of Mathematics
Characterizations of the nonlinear connection in the higher order geometry. Bucataru, Ioan — 1997 Balkan Journal of Geometry and its Applications (BJGA)
Nonholonomic frames in Finsler geometry. Bucătaru, Ioan — 2002 Balkan Journal of Geometry and its Applications (BJGA)
A geometric space without conjugate points. Bucataru, Ioan; Dahl, Matias F. — 2010 Balkan Journal of Geometry and its Applications (BJGA)