Segarra-Carmona, A. E., Santiago-Blay, J. A. and Escudero, J. (2008) “Niilo Eelis Virkki, Cytogeneticist: In Memoriam (1924-2005)”, The Journal of Agriculture of the University of Puerto Rico, 92(3-4), pp. 245–256. doi: 10.46429/jaupr.v92i3-4.2643.