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Bajpai, R., Brizhik, L., Del Giudice, E., Finelli, F., Popp, F. A., & Schlebusch, K. P. (2010). Light as a trigger and a probe of the internal dynamics of living organisms. Journal of acupuncture and meridian studies, 3(4), 291-297.
Popp, F. A. (1999). About the coherence of biophotons. In Boston University and MIT (eds) Macroscopic Quantum Coherence, Proceedings of an International Conference of the Boston University. World Scientific.