Enrique Pérez, J. “ABSENCE OF HEMAGGLUTININS FROM BUFFER EXTRACTS OF VIRUS-INFECTED LEAVES”. The Journal of Agriculture of the University of Puerto Rico 43, no. 2 (April 1, 1959): 139–140. Accessed December 22, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12552.