Submodularity Relations for the Independence Function of a Graph. - Cornelius Croitoru; Costel Radu (Sci. Ann. Cuza Univ., 1992)

Colourings and Orderings in a Graph. - Cornelius Croitoru; Costel Radu (Sci. Ann. Cuza Univ., 1992)

C-Perfect Graphs. - Cornelius Croitoru; Costel Radu (Sci. Ann. Cuza Univ., 1993)