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Z. Deng; J. H. Eberly. Multiphoton absorption above ionization threshold by atoms in strong laser fields. Journal of the Optical Society of America B. 1985, s. 491. DOI10.1364/JOSAB.2.000486. Bibcode1985JOSAB...2..486D.
The IUPAC Compendium of Chemical Terminology: The Gold Book. Příprava vydání Victor Gold. 4. vyd. Research Triangle Park, NC: International Union of Pure and Applied Chemistry (IUPAC) Dostupné online. DOI10.1351/goldbook.p04620. (anglicky) DOI: 10.1351/goldbook.