Gilbreath, G. C. Active and Passive Signatures II. SPIE Digital Library.
Lua i Stíl Chicago (17ú heag.)Gilbreath, G. Charmaine. Active and Passive Signatures II. SPIE Digital Library.
Lua MLA (8ú heag.)Gilbreath, G. Charmaine. Active and Passive Signatures II. SPIE Digital Library.
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