Usability testing in a competive market: lessons learned. - Dieter Zirkler; Donald R. Ballman (Behav. Inf. Technol., 1994)

API usability peer reviews: a method for evaluating the usability of application programming interfaces. - Umer Farooq; León Welicki; Dieter Zirkler (CHI, 2010)

API peer reviews: a method for evaluating usability of application programming interfaces. - Umer Farooq; Dieter Zirkler (CSCW, 2010)