Photionization [API] Mass Spectrometry
Syage, J.A., Evans, M.D., Hanold, K.A., American Laboratory 32, pages 24-29 (December 2000).

A New Atmospheric Pressure Ionization (API) Source
Hiraoka, K., Saito, S., Katsuragawa, J., Kudaka, I., Rapid Commun. Mass Spectrom. 12, pages 1170-1174 (1998).

Atmospheric Pressure Ionization Mass Spectrometry II:
Applications in Pharmacy, Biochemistry and General Chemistry
Bruins, A.P., Trends Anal. Chem. 13, pages 81-90 (1994).

LC/MS Update and Soft Ionization (a bimonthly international journal)
HD Science, 242 N. James Street, Tower Office Park, Suite 202, Newport, Wilmington, DE 19804-3168, USA, Phone: 302-994-8026, Fax: 302-994-8837.  Out of Print.