Hamiltonian tournaments with the least number of 3-cycles. - M. Burzio; D. C. Demaria (J. Graph Theory, 1990)

On complete strongly connected digraphs with the least number of 3-cycles. - M. Burzio; Jan Pelant (Discret. Math., 1996)

The subdivision graph of a graceful tree is a graceful tree. - M. Burzio; G. Ferrarese (Discret. Math., 1998)