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In this article, Szent-Gyorgyi reported on his initial experiments using minced pigeon breast muscle. He observed that the respiration process could be slowed by adding malic acid, and accelerated by adding succinic and fumaric acids. This was the first indication of their role as catalysts in the process.
Periodical. Gozsy, B., and Albert Szent-Gyorgyi. "Uber den Mechanismus der Hauptatmung des Taubenbrustmuskels [On the mechanism of primary respiration in pigeon breast muscle]." Hoppe-Seyler's Zeitschrift fur physiologische Chemie 224, (1934): 1-10. Article. 9 Images.. Hoppe-Seyler's Zeitschrift fur physiologische Chemie