[1] Lewis, N. (2018). Hedy Lamarr. Salem Press Biographical Encyclopedia.   
Retrieved from: link

[2] Spread Spectrum History. (n.d.). Retrieved from: link 

[3] Rothman, T. (2019). Random Paths to Frequency Hopping: Actress Hedy Lamarr famously co-patented a widely used secure-communication technology, but popular accounts ignore her many predecessors. American Scientist, (1), 46. Retrieved from: link

[4] Spread Spectrum. (n.d.). Retrieved from: link 

[5]  Spread Spectrum. (n.d.). Retrieved from: link