P, Vidyasagar, and Jayanthi Ray. 1. “Ravens Colored Progrssive Matrices- An Initial Try Out for the Development of Norms for the Hearing-Impaired.”. Journal of All India Institute of Speech and Hearing 22 & 23 (1), 30-37. http://203.129.241.91/jaiish/index.php/aiish/article/view/789.