Čech-de Rham cohomology of a refinement of a principal bundle. Ivan, Gheorghe — 1997 Balkan Journal of Geometry and its Applications (BJGA)
Principal fibre bundles with structural Lie groupoid. Ivan, Gheorghe — 2001 Balkan Journal of Geometry and its Applications (BJGA)
Numerical integration and synchronization for the 3-dimensional metriplectic Volterra system. Ivan, Gheorghe; Ivan, Mihai; Pop, Camelia — 2011 Mathematical Problems in Engineering