Demetriou IC. An Example of Nondecomposition in Data Fitting by Piecewise Monotonic Divided Differences of Order Higher than Two. In: Open Problems in Optimization and Data Analysis. Vol. 141. P.M. Pardalos, A. Migdalas, Editors. Springer Optimization and Its Applications 141, Springer Nature Switzerland AG; 2018. pp. 319-330.