Adjoining Dominating Functions. - James E. Baumgartner; Peter Lars Dordal (J. Symb. Log., 1985)

A Model in which the Base-Matrix Tree Cannot have Cofinal Branches. - Peter Lars Dordal (J. Symb. Log., 1987)

Towers in omegaomega and omega omega. - Peter Lars Dordal (Ann. Pure Appl. Log., 1989)