A. Shukla, K. Khatri, P. N. Gupta, A. K. Goyal, A. Mehta, and S. P. Vyas, “Oral immunization against hepatitis B using bile salt stabilized vesicles (bilosomes)”, J Pharm Pharm Sci, vol. 11, no. 1, pp. 59–66, Mar. 2008.