(1967). Vol. 18, № 13; Physical Review Letters. 1967.
Cita Chicago (17th ed.)Vol. 18, № 13; Physical Review Letters. 1967, 1967.
Cita MLA (9th ed.)Vol. 18, № 13; Physical Review Letters. 1967, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.