Fredrik Andersson Marcus Carlsson Jean-Yves Tourneret Herwig Wendt On an iterative method for direction of arrival estimation using multiple frequencies. 328-331 2013 CAMSAP https://doi.org/10.1109/CAMSAP.2013.6714074 conf/camsap/2013 db/conf/camsap/camsap2013.html#AnderssonCTW13