David W. Robertson, E. E. Beedle, John K. Swartzendruber, Noel D. Jones, T. K. Elzey, Raymond F. Kauffman, Harve Wilson, J. Scott Hayes,
Bipyridine cardiotonics: the three-dimensional structures of amrinone and milrinone. Journal of Medicinal Chemistry. ,vol. 29, pp. 635- 640 ,(1986) ,
10.1021/JM00155A009