Making a task difficult: evidence that device-oriented steps are effortful and error-prone
Journal of Experimental Psychology Applied (2013) - Comment
pubmed: 24059822  doi: 10.1037/a0034397  issn: 1939-2192  issn: 1076-898x 

Maartje G. A. Ament, Anna L. Cox, Ann Blandford, Duncan P. Brumby