@inbook {29073,
	title = {A Characterization Theorem for the Best L1 Piecewise Monotonic Data Approximation Problem},
	booktitle = {Contributions in Mathematics and Engineering. In Honor of Constantin Carath\'{e}odory},
	year = {2016},
	publisher = {Springer International Publishing, Switzerland},
	organization = {Springer International Publishing, Switzerland},
	edition = {Panos M. Pardalos, Themistocles M. Rassias, Editors. Forward by R. Tyrrell Rockafellar},
	author = {I. C. Demetriou}
}
