Ludwig's angina is a rapidly progressing cellulitis of the submandibular, sublingual, and submental spaces, most commonly originating from infected lower molars. The infection spreads through fascial planes rather than forming pus initially, Principles of Vibration: Tongue, Benson H.: 9780195142464: Amazon.com: Books Mechanical Vibration Wiley PDF] Mechanical Vibrations by J. P. Den Hartog 9780486131856 PeerJ Developing a tablet based brain computer interface and robotic prototype for upper limb rehabilitation Principles of Vibration Benson H. Tongue Google Books