Demetriou IC. A characterization theorem of the best piecewise monotonic data approximation by a strictly convex metric. In: Proceedings of the 7th Hellenic Conference on Statistics, Nicosia, Cyprus, Greek Statistical Institute. Vol. 1. ; 1994. pp. 31-38.

Demetriou IC, Lipitakis EA. On a stable Quadratic Programming Algorithm for l2 data approximation by non-negative divided differences. In: Proceedings of the 2nd Conference on Informatics and Mathematics. Vol. Vol. 2. E.A. Lipitakis, Editor, . Athens, Greece: Hellenic Mathematical Society Pub.; 1994. pp. 633-644.

Demetriou IC. An overview of theory for piecewise monotonic approximation. In: HERMIS 94, Proceedings of the 2nd Conference on Informatics and Mathematics . Vol. 2. E.A. Lipitakis, Editor. Athens, Greece: Hellenic Mathematical Society Publisher; 1994. pp. 667-682.

Demetriou IC, Lipitakis EA. Data modelling by least squares and non-negative divided differences. Mathematical Modelling and Scientific Computing. 1994;4:557-562.

Demetriou IC. An efficient dual strategy for strictly convex quadratic programming. Mathematical Modelling and Scientific Computing. 1994;4:513-518.

Demetriou IC. Best L1 piecewise monotonic data modelling. International Transactions in Operational Research (IFORS). 1994;1(1):85-94.