A unified framework for analyzing complex systems: Juxtaposing the (Kernel) PCA method and graph theory. - Andreas A. Ioannides; Constantinos Kourouyiannis; Christodoulos Karittevlis; Lichan Liu; Ioannis Michos; Michalis Papadopoulos; Evangelos Papaefthymiou; Orestis Pavlou; Vicky Papadopoulou Lesta; Andreas Efstathiou (Frontiers Appl. Math. Stat., 2022)