Engelberth, J., Schmelz, E.A., Alborn, H.T., Cardoza, Y.J., Huang, J. and Tumlinson, J.H. (2003) Simultaneous quantification of jasmonic acid and salicylic acid in plants by vapor-phase extraction and gas chromatography-chemical ionization-mass spectrometry. Analytical Biochemistry, 312, 242-250.