New Delhi: Congress president Sonia Gandhi has written letter to Delhi Chief Minister Sheila Dikshit asking for strict punishment for the guilty in the Delhi gang-rape case.Here is the full text of the letter:PromotedListen to the latest songs, only on JioSaavn.comAlso ReadStrong Dust Storm In Several Parts Of Delhi, Adjoining Areas: Weather OfficeNo Tie-Up With Congress For Delhi Assembly Elections Yet: AAP's Gopal RaiMan Found Dead In Locked Car Near Delhi's Nehru Place, Body Burnt