S. A. Sobhan, A. S. Khan, B. C. Das, M. M. Chowdhury, M. Z. R. Khan, and F. Sharmin, “Causes of Delayed Hospitalization In Periampullary Carcinoma and Its Correlation With Perioperative Outcome”, J Dhaka Med Coll, vol. 24, no. 1, pp. 17–23, Sep. 2016.