@article {20942,
	title = {Estimation of interannual variation in productivity of global vegetation using NDVI data},
	journal = {International Journal of Remote Sensing},
	volume = {25},
	year = {2004},
	pages = {3139-3159},
	author = {Chen, Z. M. and IS Babiker and ZX Chen and Komaki K and MAA Mohamed and K Kato}
}
