Shahjahan, R. M., M. A. Razzak, A. F. Islam, A. Saifullah, A. Yamanaka, M. Inoue, and K. Endo. “Field Studies of Butterflies: A Trial for the Establishment of Indices to Evaluate the Seasonal Fluctuations and the Ecological States of Forests in Bangladesh”. University Journal of Zoology, Rajshahi University, vol. 27, Jan. 2009, pp. 67-71, doi:10.3329/ujzru.v27i0.1958.