Echoes of enigma: bouncing submarine signals around the ocean leaves code breakers twiddling their thumbs
Sample, I. (2001). Echoes of enigma: bouncing submarine signals around the ocean leaves code breakers twiddling their thumbs. New Sci. 172(2313): 22
In: New Scientist. IPC Magazines Ltd./Reed Business Information: London. ISSN 0262-4079, more
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