Boris D. Zlatopolskiy, Heike Endepols, Raisa N. Krasikova, Olga S. Fedorova, Johannes Ermert, Bernd Neumaier, “$^{11}\mathrm{C}$- and $^{18}\mathrm{F}$-labelled tryptophans as PET-tracers for imaging of altered tryptophan metabolism in age-associated disorders”, Usp. Khim., 89:9 (2020), 879–896; Russian Chem. Reviews, 89:9 (2020), 879–896
