David M. J. Tax Martijn van Breukelen Robert P. W. Duin Josef Kittler Combining multiple classifiers by averaging or by multiplying? 1475-1485 2000 33 Pattern Recognition 9 http://dx.doi.org/10.1016/S0031-3203(99)00138-7 db/journals/pr/pr33.html#TaxBDK00