p-brane Dyons, theta-terms and Dimensional Reduction
  We present two novel derivations of the recently established $(-)^p$ factor in the charge quantization condition for $p$-brane dyon sources in spacetime dimension $D$=$2p$+2. The first requires consistency of the condition under the charge shifts produced by (generalized) $\theta$-terms. The second traces the sign difference between adjoining dimensions to compactification effects. 
S. Deser (Brandeis University), M. Henneaux (Universit\'e Libre de   Bruxelles) and A. Schwimmer (Weizmann Institute)