7Andrawes, F. F. 1984. Detection of traces of formaldehyde in pure air by gas chromatography and helium ionization detection. J. Chromatogr Sci. 22(11): 506～508.
8Gold, T. B. , Buice, R. G. Jr. , Lodder, R. A. , and Digenis, G. A. 1997. Determination of extent of formaldehyde-induced crosslinking in hard gelatin capsules by near-infrared spectrophotometry. Pharm. Res. 14(8): 1 046～1 050.
9Iben, E. B. 1995. Determination of formaldehyde in frozen fish formaldehyde dehydrogenase using a flow injection system with an incorporated gel-filtration column. Analytica Chimica Acta. 320: 155～164.
10Lewandowska, I. , and Jurkiewicz, M. 1993. Determination of unbound formaldehyde in protein coverings using the colorimetric method with chromotropic acid. Rocz. Panstw. Zakl. Hig. 44(23): 175～179.
