Inherent restrictions of the Hylleraas-Undheim-MacDonald higher roots, and minimization functionals at the excited states. - Naoum C. Bacalis; Z. Xiong; Dimitrios Karaoulanis (J. Comput. Methods Sci. Eng., 2008)

Correct small-truncated excited state wave functions obtained via minimization principle for excited states compared/ opposed to Hylleraas-Undheim and McDonald higher "roots". - Z. Xiong; J. Zang; H. J. Liu; Dimitrios Karaoulanis; Q. Zhou; Naoum C. Bacalis (J. Comput. Methods Sci. Eng., 2017)

On Λ-Fractional Viscoelastic Models. - Anastassios K. Lazopoulos; Dimitrios Karaoulanis (Axioms, 2021)

Fractional Derivatives and Projectile Motion. - Anastassios K. Lazopoulos; Dimitrios Karaoulanis (Axioms, 2021)

The Λ-Fractional Hydrocephalus Model. - Anastassios K. Lazopoulos; Dimitrios Karaoulanis; Kostantinos A. Lazopoulos (Axioms, 2022)

On Λ-Fractional Derivative and Human Neural Network. - Dimitrios Karaoulanis; Anastassios K. Lazopoulos; N. Lazopoulou; Kostantinos A. Lazopoulos (Axioms, 2023)