Photophysics of aqueous tryptophan: pH and temperature effects
http://pubs.acs.org/doi/pdf/10.1021/ja00540a016


pH dependence of the fluorescence decay of tryptophan
http://pubs.acs.org/doi/abs/10.1021/bi00815a025
https://www.ncbi.nlm.nih.gov/pubmed/5450239


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