Internet vs. paper and pencil administration of questionnaires commonly used in panic/agoraphobia research. - Per Carlbring; Sara Brunt; Susanne Bohman; David Austin; Jeffrey Richards; Lars-Göran Öst; Gerhard Andersson (Comput. Hum. Behav., 2007)

Web-based measurement: Effect of completing single or multiple items per webpage. - Frances P. Thorndike; Per Carlbring; Frederick L. Smyth; Joshua C. Magee; Linda Gonder-Frederick; Lars-Göran Öst; Lee M. Ritterband (Comput. Hum. Behav., 2009)