Unnikrishnan, S., M. C. Narasimhan, and K. . Venkataramana. “Free Vibration Studies of Box Type Laterite Masonry Structures”. Journal of Structural Engineering, vol. 39, no. 3, Dec. 2024, pp. 332-46, http://jose.serc.res.in/index.php/JOSE/article/view/1052.