Boneh, Dan; Venkatesan, Ramarathnam (1998). "Breaking RSA may not be equivalent to factoring". Advances in Cryptology – EUROCRYPT'98. Lecture Notes in Computer Science. Vol. 1403. Springer. pp. 59–71. doi:10.1007/BFb0054117. ISBN978-3-540-64518-4.
An algorithm for this is, for example, given in Menezes; van Oorschot; Vanstone (2001). "Public-Key Encryption"(PDF). Handbook of Applied Cryptography.