Gumz, W. 1. (1950). Gas producers and blast furnaces; theory and methods of calculation. Wiley.
Lua i Stíl Chicago (17ú heag.)Gumz, Wilhelm 1901. Gas Producers and Blast Furnaces; Theory and Methods of Calculation. New York: Wiley, 1950.
Lua MLA (9ú heag.)Gumz, Wilhelm 1901. Gas Producers and Blast Furnaces; Theory and Methods of Calculation. Wiley, 1950.
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