R Laroia, J Li, A Jovicic, T Richardson,
X Wu - US Patent 8,601,156, 2013 - Google Patents
6,532,369 6,614,810 6,681,115 6,718,395 6,804,542 6,894,975 6,968,153 7,027,415
7,218,623 7,272,656 7,290,047 7,313,120 7,342.895 7,356,022 7,433,944 7,570.615 …