Sah, B. P., S. T. Chettri, J. N. Prasad, P. P. Gupta, S. P. shah, D. Paudel, and R. K. Jaiswal. “Foreign Body Stone in Oesophagus: A Unique Case”. Health Renaissance, vol. 12, no. 2, Dec. 2015, pp. 140-2, doi:10.3126/hren.v12i2.14120.