GUTMAN, Ivan. Relating graph energy with vertex-degree-based energies. Vojnotehnički glasnik / Military Technical Courier, [S. l.], v. 68, n. 4, p. 715–725, 2020. DOI: 10.5937/vojtehg68-28083. Dostupno na: https://asistent.ceon.rs/index.php/vtg/article/view/28083. Pristupljeno: 12 jul. 2026.