Interpersonal connectedness: conceptualization and directions for a measurement instrument. - Daniel T. van Bel; Wijnand A. IJsselsteijn; Yvonne de Kort (CHI Extended Abstracts, 2008)

Social connectedness: concept and measurement. - Daniel T. van Bel; K. C. H. J. Smolders; Wijnand A. IJsselsteijn; Yvonne de Kort (Intelligent Environments, 2009)

PMRI: development of a pictorial mood reporting instrument. - Martijn H. Vastenburg; Natalia Romero Herrera; Daniel T. van Bel; Pieter Desmet (CHI Extended Abstracts, 2011)