Gilbreath, G. C. Active and Passive Signatures III. SPIE Digital Library.
Tohutoru Kātū Chicago (17th ed.)Gilbreath, G. Charmaine. Active and Passive Signatures III. SPIE Digital Library.
Tohutoro MLA (9th ed.)Gilbreath, G. Charmaine. Active and Passive Signatures III. SPIE Digital Library.
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