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- [1] THE USE OF THE SPEKKER PHOTOELECTRIC ABSORPTIOMETER FOR THE DETERMINATION OF PH JOURNAL OF THE CHEMICAL SOCIETY, 1952, (OCT): : 3848 - 3854
- [8] THE DETERMINATION OF COMBINED CARBON IN CAST IRON BY MEANS OF THE SPEKKER PHOTO-ELECTRIC ABSORPTIOMETER JOURNAL OF THE SOCIETY OF CHEMICAL INDUSTRY-LONDON, 1949, 68 (02): : 49 - 52