*Joachim Raupp: "Examination of some microbiological and biochemical parameters and tests of product quality used in a long-term fertilization trial", American Journal of Alternative Agriculture, Volume 13, Issue 03, September 1998, Seiten 138-144 | *Joachim Raupp: "Examination of some microbiological and biochemical parameters and tests of product quality used in a long-term fertilization trial", American Journal of Alternative Agriculture, Volume 13, Issue 03, September 1998, Seiten 138-144 |