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Sarapatka, B., M. Holub, et al. (1993). The effect of farmyard manure anaerobic treatment on weed seed viability. Biological Agriculture and Horticulture 10(1): 1-8. {a} Dep. Ecology, Palacky Univ., Olomouc, Czech Republic

Wedin, D. and D. Tilman (1993). Competition among grasses along a nitrogen gradient: Initial conditions and mechanisms of competition. Ecological Monographs 63(2): 199-229. {a} Dep. Bot., Univ. Tokyo, 25 Willcocks St., Toronto, Ontario M5S 3B2, Canada

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