2) R. J. Kauth and G. S. Thomas: “The tasselled capa graphic description of the spectral-temporal development of agricultural crops as seen by LANDSAT”, LARS symposium on machine processing of remotely sensed data, (1976)
3) R. A. Abotteen: “Principal component greenness transformation in multitemporal agricultural LANDSAT data”, Proceedings of the 12th symposium on remote sensing of environment, University of Michigan, (1978)