1. Feinstone, S. M., Kapikian, A. Z., Purcell, R. H. Hepatitis A: Detection by immune electron microscopy of a viruslike antigen associated with acute illness. Science 182 (1973) 1026–1028.
2. Purcell, R. H., Wong, D. C., Moritsugi, Y., Dienstag, J. L., Routenberg, J. A., Boggs, J. D. A microtiter solid-phase radio-immunoassay for hepatitis A antigen and antibody. J. Immunol. 116 (1976) 349–356.
3. Szmuness, W., Dienstag, J. L., Purcell, R. H., Stevens, C. E., Wong, D. C., Ikram, H., Bar-Shany, S., Beasley, R. P., Desmyter, J., Gaon, J. A. The prevalence of antibody to hepatitis A antigen in various parts of the world; a pilot study. Am. J. Epidemiol. 106 (1977) 392–398.
4. Villarejos, V. M., Provost, P. J., Ittensohn, O. L., McLean, A. A., Hilleman, M. R. Seroepidemiologic investigations of human hepatitis caused by A, B, and a possible third virus. Proc. Soc. Exp. Biol. Med. 152 (1976) 524–528.
5. Frösner, G., Iwarson, S., Lindholm, A., Norkrans, G. Antibodies against hepatitis A among Swedish blood donors. Läkartidningen 75 (1978) 544–545.