ANIRUDDHA JOSHI; PROF. PUSPENDRA UPADHYAY. A REVIEW STUDY ON VARIABLE VALVE TIMING SYSTEMS. International Journal of Innovations in Engineering Research and Technology, Maharashatra, India, p. 1–5, 2021. Disponível em: https://repo.ijiert.org/index.php/ijiert/article/view/1763. Acesso em: 24 apr. 2026.