pid type title authors mentors source_title published_date url doi isbn issn eissn kbco:107 "journal article" "Hidden Information in Three-axial ECG data of Normal Subjects: Fractal Dimensions of Corresponding Points from Successive QRS Loops as a Potential Sport and age Dependent Marker" "Čalošević, Srdjan; Dinjar, Kristijan; Čalošević, Suzana; Kurbel, Sven; Steiner, Robert 1"