Papanastassiou,Z.B. et al.
Journal of Medicinal Chemistry, 1966 , vol. 9, p. 357 - 359

Lacan, Goran; Kesner, Amanda L.; Gangloff, Anne; Zheng, Lei; Czernin, Johannes; Melega, William P.; Silverman, Daniel H. S.
Journal of Labelled Compounds and Radiopharmaceuticals, 2005 , vol. 48, # 9 p. 635 - 643