Władysław Kozaczuk, Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two, edited and translated by Christopher Kasparek, Frederick, MD, University Publications of America, 1984, ISBN 0-89093-547-5.
ZX Spectrum | spectrum | Spectrum | electromagnetic spectrum | Visible spectrum | Electromagnetic spectrum | Autism spectrum | spread offense | spread | Spectrum (band) | Guildford Spectrum | United States 2008 wireless spectrum auction | Spread My Wings | Spread (film) | Spread betting | Spread | Spectrum Radio | Medisch Spectrum Twente | IEEE Spectrum | Full Spectrum Warrior | Frequency spectrum | 2G spectrum scam | World-Wide Spectrum Efficiency | visible spectrum | The Twelve Kingdoms: The Vast Spread of the Seas | Spread Toolkit | spread spectrum | Spread offense | Spread Networks | Spread a Little Happiness |
In 1997, Dr. Hatim Zaghloul learnt that Hedy Lamarr was never compensated for her invention of frequency hopping spread spectrum.