Khang, Bạch Hưng, et al. “An Examination of Techniques for Raster-to-Vector Process and Implementation of Software Package for Automatic Map Data Entry-Mapscan”. <i>Journal of Computer Science and Cybernetics</i>, vol. 12, no. 2, Apr. 2016, p. 21-29, doi:10.15625/1813-9663/12/2/8074.