A system for inducing concurrent tactile and nociceptive sensations at the same site using electrocutaneous stimulation
Behavior Research Methods (2012) - Comment
pubmed: 22806702  doi: 10.3758/s13428-012-0216-y  issn: 1554-3528 

Peter Steenbergen, Jan R. Buitenweg, Jörg Trojan, Esther M. Van Der Heide, Teun Van Den Heuvel, Herta Flor, Peter H. Veltink