GALLO, James Mendoza; BUTANAS JR., Bienvenido Masirin. Quantum Propagator Derivation for the Ring of Four Harmonically Coupled Oscillators. Jurnal Penelitian Fisika dan Aplikasinya (JPFA), [S. l.], v. 9, n. 2, p. 92–104, 2019. DOI: 10.26740/jpfa.v9n2.p92-104. Disponível em: https://journal.unesa.ac.id/index.php/jpfa/article/view/4194. Acesso em: 21 jul. 2025.