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Most biologists, (says Vogel, 1981) seem to have heard of the boundary layer, but they have a fuzzy notion that it is a discrete region, rather than the discrete notion that it is a fuzzy region.
Source: Permaculture: A Designers Manual chapter 4.40

Most biologists, (says Vogel, 1981) seem to have heard of the boundary layer, but they have a fuzzy notion that it is a discrete region, rather than the discrete notion that it is a fuzzy region. by : Bill Mollison