Variable-exponent taper equations for jack pine, black spruce, and balsam fir in eastern Canada

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Modeling Forest Trees and Stands (2012, methodology): “Sharma and Zhang (2004) modified Eq.”
Nonlinear mixed-effects modeling of variable-exponent taper equations for lodgepole pine in Alberta, Canada (2009, methodology): “To date, parameter estimates for variable-exponent taper functions have been obtained in most cases using ordinary nonlinear least square methods (Kozak 1988, 2004; Huang et al. 1999, 2000; Sharma and Zhang 2004).”
Compatible taper function for Scots pine plantations in northwestern Spain (2006, background): “In comparison with single and segmented taper models, this approach usually provides the lowest degree of local bias and the greatest precision in taper predictions (e.g., Kozak 1988; Pérez et al. 1990; Newnham 1992; Muhairwe 1999; Bi 2000; Sharma and Zhang 2004).”
Regional stem taper equations for eleven conifer species in the Acadian Region of North America: development and assessment. (2012, background): “Forest Management Research and Services Institute, Ottawa, Ont., Canada.”