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Usova A.A. et al., "Protein inhibitor of cyclic nucleotide phosphodiesterase in the retina in hereditary degeneration." Voprosy Meditsinskoi Khimii 24.2 (1978): 227-232.
Usova, A. A., Ostapenko, I. A., Etingof, R. N. (1978). Protein inhibitor of cyclic nucleotide phosphodiesterase in the retina in hereditary degeneration. Voprosy Meditsinskoi Khimii, 24(2), 227-232.