L. Figueroa-Valverde, F. Diaz-Cedillo, E. Garcia-Cervera, E. Pool-Gomez, M. Rosas-Nexticapan, and M. Lopez-Ramos, “An Easy Synthesis of Two Steroid-Dihydropyrimidine Derivatives Using Three Components System”, ajc, vol. 25, no. 12, pp. 6815–6817, Jun. 2013.