Vassiliou EE, Demetriou IC. An adaptive algorithm for least squares piecewise monotonic data fitting. Computational Statistics and Data Analysis, 2nd Special Issue on Computational Econometrics. 2005;Vol. 49:591-609.

Demetriou IC, Papakonstantinou SS. Conditions for the discrete best L1 piecewise linear regression (Συνθήκες για τη Διακριτή Άριστη L1 κατά Τμήματα Γραμμική Παλινδρόμηση). In: Proceedings of the 18th Hellenic Conference on Statistics, Rhodos, Greek Statistical Institute. ; 2005. pp. 8 pp.

Demetriou IC, Papakonstantinou SS. On a Descent Algorithm for the Discrete Best L1 Linear Spline Approximation Problem. In: Proceedings of the 7th Hellenic - European Conference on Computer Mathematics and its Applications, HERCMA 2005. ; 2005. pp. 7.

Demetriou IC, Lipitakis EA, Vassiliou EE. Examples on an Algorithm for Least Squares Data Fitting By Nonnegative Differences. In: Proceedings of the 7th Hellenic - European Conference on Computer Mathematics and its Applications HERCMA 2005. ; 2005. pp. 13.