James F. Peters Zbigniew Suraj S. Shan Sheela Ramanna Witold Pedrycz Nicolino J. Pizzi Classification of meteorological volumetric radar data using rough set methods. 911-920 2003 24 Pattern Recognition Letters 6 http://dx.doi.org/10.1016/S0167-8655(02)00203-9 db/journals/prl/prl24.html#PetersSSRPP03