"Wolf's isotopic response": the originators speak their mind and set the record straight.

Having been the first to have introduced the concept of "isotopic response" three decades ago, we wanted to express some of our thoughts on its current application, now that more than 100 such cases have been reported in the literature. It is, of course, gratifying to read about its appropriate application, and it is our hope that others will refrain from distorting its original meaning.