The Hysteresis Effect. - Philip S. E. Farrell (Hum. Factors, 1999)

Perceptual control and layered protocols in interface design: I. Fundamental concepts. - P. S. E. Farrell; J. G. Hollands; M. M. Taylor; H. D. Gamble (Int. J. Hum. Comput. Stud., 1999)

Perceptual control and layered protocols in interface design: II. The general protocol grammar. - M. M. Taylor; P. S. E. Farrell; J. G. Hollands (Int. J. Hum. Comput. Stud., 1999)