Variable and Term Removal From Boolean Formulae. - Yves Crama; Oya Ekin; Peter L. Hammer (Discret. Appl. Math., 1997)

Horn Functions and Submodular Boolean Functions. - Oya Ekin; Peter L. Hammer; Uri N. Peled (Theor. Comput. Sci., 1997)

On Connected Boolean Functions. - Oya Ekin; Peter L. Hammer; Alexander Kogan (Discret. Appl. Math., 1999)

Equational characterizations of Boolean function classes. - Oya Ekin; Stephan Foldes; Peter L. Hammer; Lisa Hellerstein (Discret. Math., 2000)

Boolean Normal Forms, Shellability, and Reliability Computations. - Endre Boros; Yves Crama; Oya Ekin; Peter L. Hammer; Toshihide Ibaraki; Alexander Kogan (SIAM J. Discret. Math., 2000)

Convexity and logical analysis of data. - Oya Ekin; Peter L. Hammer; Alexander Kogan (Theor. Comput. Sci., 2000)