Anu Lehtovuori Risto Valkonen Martti Valtonen Accessible approach to wideband matching. 244-247 2012 ICECS https://doi.org/10.1109/ICECS.2012.6463755 conf/icecsys/2012 db/conf/icecsys/icecsys2012.html#LehtovuoriVV12