Thiện, P.V., Sinh, T.N. and Quang, N.T. 2021. On the Castelnuovo-Mumford regularity index of the coordinate ring of a set of n + 3 non-degenerate fat points in projective space Pn. Hue University Journal of Science: Natural Science. 130, 1C (Jun. 2021), 15-22. DOI:https://doi.org/10.26459/hueunijns.v130i1C.6334.