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harvard.edu
ui.adsabs.harvard.edu
Siirola, J. J. (April 1993). "Chemical process structures and information flows. By Richard S. H. Mah, Butterworth, 1990, 500 pp". AIChE J. 39 (4): 730. Bibcode:1993AIChE..39..730S. doi:10.1002/aic.690390430.
