Hofmann, D. J. y Rosen, J. M. (1984) «Balloonborne particle counter observations of the El Chichón aerosol layers in the 0.01 - 1.8 µm radius range», Geofísica Internacional, 23(2), pp. 155–185. doi: 10.22201/igeof.00167169p.1984.23.2.836.