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 C. D.  Canham and J. S.  Kays, Classification and gradient analysis of right-of-way vegetation in the Mid-Hudson Valley. 1993, p. 7-30.\par \par  J. S.  Kays and C. D.  Canham, ?Effects of time and frequency of cutting on hardwood root reserves and sprout growth?, For. Sci., vol. 37, p. 524-539, 1991.\par \par }