Boulton, L. (2003). Limiting set of second order spectra.
Cita Chicago (17th ed.)Boulton, Lyonell. Limiting Set of Second Order Spectra. 2003.
Cita MLA (9th ed.)Boulton, Lyonell. Limiting Set of Second Order Spectra. 2003.
Atenció: Aquestes cites poden no estar 100% correctes.