State of the Art and Future Challenges of the Portrayal of Facial Nonmanual Signals by Signing Avatar. - Rosalee J. Wolfe; John McDonald 004; Ronan Johnson; Robyn Moncrief; Andrew Alexander; Ben Sturr; Sydney Klinghoffer; Fiona Conneely; Maria Saenz; Shatabdi Choudhry (HCI (7), 2021)