1. Alberta Environmental Protection (1988) Alberta Phase 3 forest inventory: tree sectioning manual. Pub. No. T/168, Alberta Environmental Protection, Edmonton
2. Burkhart HE, Watson SB (1985) Incorporating crown ratio into taper equations for loblolly pine trees. For Sci 31:478–484
3. Calama R, Montero G (2004) Interregional nonlinear height-diameter model with random coefficients for stone pine in Spain. Can J Res 34:150–163. doi: 10.1139/x03-199
4. Clutter JL, Fortson JC, Pienaar LV, Brister GH, Bailey RL (1983) Timber management: a quantitative approach. Wiley, New York
5. Cochran WG (1963) Sampling techniques, 2nd edn. Wiley, New York