South African Journal of ScienceOn-line version ISSN 1996-7489
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NUCCI, M.C. and LEACH, P.G.L.. Singularity and symmetry analyses of mathematical models of epidemics. S. Afr. j. sci. [online]. 2009, vol.105, n.3-4, pp. 136-146. ISSN 1996-7489.
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