Specifying ACT-R models of user interaction with a GOMS language. - Robert St. Amant; Andrew R. Freed; Frank E. Ritter (Cogn. Syst. Res., 2005)

Discovering user information needs: the case of university department web sites. - Frank E. Ritter; Andrew R. Freed; Onida L. M. Haskett (Interactions, 2005)