Quinn, P., T.L. Anderson, T.S. Bates, R. Dlugi, J. Heintzenberg, W. von Hoyningen-Huene, M. Kulmala, P.B. Russell, and E. Sweitlicki (1996), Closure in tropospheric aerosol-climate research: A review and future needs, Contr. Atmos. Phys./Beitr. Phys. Atmosph., 69, 547-577.