Automated Direct Probe
Nanura, J. J., Nanura, D. J., "Design and development of an automated direct probe for a mass spectrometer," American Laboratory 33 pages 40, 42, 44-47, 49, 51, 53,  (2001).

Particle Beam Liquid Chromatography-Mass spectrometry:
Instrumentation and Applications. A Review
Creaser, C.S., Stygall, J.W., Analyst 118, pages 1467-1480 (1993).

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.