iSign: An Architecture for Humanoid Assisted Sign Language Tutoring. - Hatice Kose-Bagci; Neziha Akalin; Rabia Yorganci; Bekir Sitki Ertugrul; Hasan Kivrak; Semih Kavak; Ahmet Özkul; Cemal Gurpinar; Pinar Uluer; Gökhan Ince (Intelligent Assistive Robots, 2015)