Chazelle, B., &; Edelsbrunner, H. (1987). An improved algorithm for constructing kth-order Voronoi diagrams. IEEE Transactions on Computers. IEEE.https://doi.org/10.1109/TC.1987.5009474 
LibreCat: https://research-explorer.ista.ac.at/record/4095
DOI: 10.1109/TC.1987.5009474