Constructing self-dual codes using graphs. - Haluk Oral (J. Comb. Theory B, 1991)

Self-orthogonal codes with distance four are not rigid. - Haluk Oral (Discret. Math., 1992)

Almost All Self-Dual Codes Are Rigid. - Haluk Oral; Kevin T. Phelps (J. Comb. Theory A, 1992)

Eulerian Self-Dual Codes. - László Babai; Haluk Oral; Kevin T. Phelps (SIAM J. Discret. Math., 1994)