Roll, Richard (1977). "A critique of the asset pricing theory's tests Part I: On past and potential testability of the theory". Journal of Financial Economics. 4 (2): 129–176. doi:10.1016/0304-405X(77)90009-5. S2CID15083599.
Roll, Richard (1977). "A critique of the asset pricing theory's tests Part I: On past and potential testability of the theory". Journal of Financial Economics. 4 (2): 129–176. doi:10.1016/0304-405X(77)90009-5. S2CID15083599.