References
Daughtry, C.S.T, Biehl, L. L. and Ranson, K. J. 1989. A new technique to measure the spectral properties of conifer needles. Remote Sens. Environ. 27:81-91.
Mesarch, M. A., Walter-Shea, E. A., Asner, G. P., Middleton, E. M. and Chan, S. S. 1999. A revised measurement methodology for conifer needles spectral optical properties: evaluating the influence of gaps between elements. Remote Sens. Environ. 68:177-192.