I've been trying to get hold of the following article, but without much success:
Janssen, T., Steinhoff, H.-J., and Bøhnke, F. (1991). ‘‘Zum Entstehungsmechanismus
der Frequenfolgepotentiale,’’ Otorhinolaryngol. Nova. 1,
I don't suppose anyone has a pdf of this article they could send me?