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Stief, Christian Georg and Jünemann, K. P. and Kellner, H. and Gerstenberg, T. and Merckx, L. and Wagner, G. (1994): Consensus and Progress in Corpus Cavernosum-EMG (CC-EMG). In: International Journal of Impotence Research, Vol. 6, No. 3: pp. 177-182

Stief, Christian Georg and Merckx, L. (1992): Single Potential Analysis of Cavernous Electric Activity (SPACE) -experiences and Refinements. In: International Journal of Impotence Research, Vol. 4, No. 3: pp. 131-143