Paper or plastic? Data equivalence in paper and electronic diaries
Psychological Methods (2006) - Comment
pubmed: 16594769  doi: 10.1037/1082-989x.11.1.87  issn: 1082-989x  issn: 1939-1463 

Amie S. Green, Eshkol Rafaeli, Niall Bolger, Patrick E. Shrout, Harry T. Reis