I. Benitez-García, P. E. Vanegas-Espinoza, A. J. Melendez-Martínez, F. J. Heredia, O. Paredes-López, and A. A. Del Villar-Martínez, “Callus culture development of two varieties of Tagetes erecta and carotenoids production”, Electron. J. Biotechnol., vol. 17, no. 3, May 2014.