article The secret is sulphur 5 November 2020 | By Bernhard Ringer, Professor Erich Leitner Professor Erich Leitner and Bernhard Ringer of the Graz University of Technology explain the importance of sulphur compounds in roasted coffee.
reference References: The secret is sulphur 1 October 2020 | By Bernhard Ringer, Professor Erich Leitner References for article (Issue 5 2020) in which Erich Leitner and Bernhard Ringer explain importance of sulphur compounds in roasted coffee.