P. Palanisamy N. Kalyanasundaram A. Raghunandan A new DOA estimation algorithm for wideband signals in the presence of unknown spatially correlated noise. 1921-1931 2009 89 Signal Processing 10 http://dx.doi.org/10.1016/j.sigpro.2009.03.033 db/journals/sigpro/sigpro89.html#PalanisamyKR09