@article {1625,
	title = {Stratospheric Aerosol Optical Depths, 1850-1990.},
	journal = {Journal of Geophysical Research},
	volume = {98},
	year = {1993},
	pages = {22987-22994},
	author = {Sato, M. and Hansen, J.E. and McCormick, M.P and Pollack, J.B.}
}
