Chinnapat Buachart, and Chayanon Hansapinyo. “ON THE CONSTRUCTION OF THE NODAL EXACT FINITE ELEMENT MODEL FOR AXIALLY LOADED PILE IN ELASTOPLASTIC SOIL”. GEOMATE Journal, vol. 12, no. 31, Dec. 2016, pp. 147-52, https://geomatejournal.com/geomate/article/view/1172.