R. Yeshwanth, L. K. Bairy, R. Deepthinath, and B. Ramachandra, “A Study of the Effect of Methotrexate and Vitamin A on NOR Expression in Hepatocytes of Male Wistar Rats”, J Physiol Biomed Sci, vol. 23, no. 1, pp. 1–7, Sep. 2010.