[74] S. Steinwand, T. Halbritter, D. Rastädter, J. M. Ortiz-Sánchez, I. Burghardt, A. Heckel, J. Wachtveitl
       Ultrafast spectroscopy of hydroxy-substituted azobenzenes in water
       Chem. Eur. J. 2015, 21, 15720-15731

         Link: