Julie R. Glasson, G.Randall Green, J.Francisco Nistal, Paul Dagum, Masashi Komeda, George T. Daughters, Ann F. Bolger, Linda E. Foppiano, Neil B. Ingels, D.Craig Miller,
Mitral annular size and shape in sheep with annuloplasty rings The Journal of Thoracic and Cardiovascular Surgery. ,vol. 117, pp. 302- 309 ,(1999) ,
10.1016/S0022-5223(99)70427-7