K. J. Kirby, T. Bines, A. Burn, J. Mackintosh, P. Pitkin, I. Smith, Seasonal and Observer Differences in Vascular Plant Records from British Woodlands, Journal of Ecology, Vol. 74, No. 1 (Mar., 1986), pp. 123-131
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Kirby et al. (1986) studied this question.
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