Saravana Kumar, A., P. Renuka Devi, and K.R. Mani. 2011. “Optimization and In Vitro Evaluation of Alginate: Hydroxypropyl Methylcellulose Microspheres Loaded Tetanus Toxoid Vaccine”. Asian Journal of Chemistry 23 (7):3279-82. https://asianpubs.org/index.php/ajchem/article/view/10569.