Shahjahan, R. M., Razzak, M. A., Islam, A. F., Saifullah, A., Yamanaka, A., Inoue, M. and Endo, K. (2009) “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, 27, pp. 67–71. doi: 10.3329/ujzru.v27i0.1958.