Vibroarthrography for early detection of knee osteoarthritis using normalized frequency features. - Nima Befrui; Jens Elsner; Achim Flesser; Jacqueline Huvanandana; Oussama Jarrousse; Tuan Nam Le; Marcus Müller; Walther H. W. Schulze; Stefan Taing; Simon Weidert (Medical Biol. Eng. Comput., 2018)