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J.J. Boon and J.R. Haverkamp, Pyrolysis mass spectrometry of intact and decomposed leaves of Nuphar Variegatum and Zostera Marina, and some archeological eelgrass samples, Hydrobiol. Bull. 16, 71-82 (1982)
G. Wieten, J.R. Haverkamp, L.G. Berwald, D.G. Groothuis and P. Draper, Pyrolysis Mass Spectrometry: Its Applicability to Mycobacteriology, including Mycobacterium Leprae, Ann. Microbiol. 1, 15-27 (1982)
G.J.Q. van der Peyl, K. Isa, J.R. Haverkamp and P.G. Kistemaker, Cationization in laser desorption mass spectrometry, Nucl. Instrum. Methods Phys. Res. 198, 125-130 (1982)
J.J. Boon, R.G. Wetzel and G.L. Godshalk, Pyrolysis mass spectrometry of some Scirpus species and their decomposition products, Limnol. Oceanogr. 27, 839-848 (1982)