ELVERS, B. Ullmann;s enciklopdia of industrial chemistry volume: B4. vch.
Lua i Stíl Chicago (17ú heag.)ELVERS, Barbara. Ullmann;s Enciklopdia of Industrial Chemistry Volume: B4. vch.
Lua MLA (8ú heag.)ELVERS, Barbara. Ullmann;s Enciklopdia of Industrial Chemistry Volume: B4. vch.
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