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Pechmann, J.H.K., Scott, D.E., Semtitsch, R.D., Caldwell, J.P., Vitt, L.J. and Gibbsons J.W. (1991) Declining amphibian populations: The problem of separating human impacts from natural fluctuations. Science, 253, 892-895. doi:10.1126/science.253.5022.892

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