Sawyer ea 1980
Sawyer T.K., Sanfilippo P.J., Hruby V.J., Engel M.H., Heward C.B., Burnett J.B., Hadley M.E. 4-Norleucine, 7-D-phenylalanine-alpha- melanocyte-stimulating hormone: a highly potent alpha-melanotropin with ultralong biological activity. // Proc. Natl. Acad. Sci. USA, 1980, v. 77, N 10, p. 5754-5758.
