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References
- 1 2 3 4 5 Hagelin, Boris, Cryptograph company documents (Personal archives), vol. A1:1, Krigsarkivet, Stockholm
- 1 2 McKay, C.G.; Beckman, Bengt (2003). Swedish signal intelligence 1900–1945. London: Frank Cass. pp. 25–28. ISBN 0-7146-5211-3.
- ↑ de Leeuw, Karl Maria Michael; Bergstra, Jan (28 August 2007). The History of Information Security: A Comprehensive Handbook. Elsevier. p. 480. ISBN 978-0080550589.
- ↑ Widman, Kjell-Ove; Wik, Anders (2017). Damm and AB Cryptograph. FRA historical series. Vol. 27. Bromma.
- ↑ Kruh, Louis (1978). "A catalog of historical interest". Cryptologia. 2 (4). UK: Taylor & Francis: 243–252 and 339–349. doi:10.1080/0161-117891853225.
- 1 2 Crypto Hauszeitung Nr. 11. Zug (1992). 100 Jahre Boris Hagelin 1892–1992 (PDF). Schweiz. pp. 39–43 and 65.
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