M. Ramírez Villalobos, E. de García, H. Lindorf, and H. Finol, “Morphoanatomy and ultrastructure studies on embryogenic and non-embryogenic calluses of Williams banana (Musa sp.): I. Inmature male flowers.”, Rev. Fac. Agron. (LUZ), vol. 30, no. 3, Nov. 2013.