Polikarpov I-180 (Italian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Polikarpov I-180" in Italian language version.

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archive.org

Nemecek, 1986, p.40. (EN) Vaclav Nemecek, Experiments with Fighters in the 1930s; Interceptor Fighters, in The History of Soviet Aircraft from 1918, Londra, William Collins Sons & Co, 1986, pp. 40-42; 60-62, ISBN 978-0-00-218033-7.
Nemecek, 1986, p.41. (EN) Vaclav Nemecek, Experiments with Fighters in the 1930s; Interceptor Fighters, in The History of Soviet Aircraft from 1918, Londra, William Collins Sons & Co, 1986, pp. 40-42; 60-62, ISBN 978-0-00-218033-7.