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Lua i Stíl Chicago (17ú heag.)Heick, Walter. Akrodermatitis Chronica Atrophicans. Freiburg i. Br.: Speyer & Kaerner, 1919.
Lua MLA (8ú heag.)Heick, Walter. Akrodermatitis Chronica Atrophicans. Speyer & Kaerner, 1919.
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