2) Brown, G.C. & O'leary, T.P.: Fluorescent antibodies to influenza virus in various immunoglobulin fractions of serum after natural infection or vaccination. J. Immunol., 110: 889-896, 1973.
3) Cradock-Watson, J.E. & Ridehalgh, M.K.S.: Immunoglobulin responses after rubella infection. Annals New York Academy of Sciences, 254: 385-393, 1975.
4) Skaug, K., Eng, J., Orstavik, I. & Haug, K. W.: The diagnostic value of determination of IgM antibodies against Mycoplasma pneumoniae by the indirect immunofluorescent antibody test. Acta Path. Microbiol. Scand. Sect. B, 84: 170-176, 1976.
5) Inouye, S., Kono, R. & Takeuchi, Y.: Oligomeric immunoglobulin A antibody response to rubella virus infection. J. of Clin. Microbiol., 8: 1-6, 1978.