B. B.  Shingate, Hazra, B. G., Pore, V. S., Gonnade, R. G., and Bhadbhade, M. M., ?Stereoselective syntheses of unnatural steroidal C(20R) aldehydes by ionic hydrogenation of C-20 tertiary alcohols?, Tetrahedron Letters, vol. 47, no. 52, pp. 9343-9347, 2006.