OPPENHEIM ,ALAN V. (1997). SIGNALS & SYSTEMS: 2ND ED. PHI.
Lua i Stíl Chicago (17ú heag.)OPPENHEIM ,ALAN V. SIGNALS & SYSTEMS: 2ND ED. NEW DELHI: PHI, 1997.
Lua MLA (9ú heag.)OPPENHEIM ,ALAN V. SIGNALS & SYSTEMS: 2ND ED. PHI, 1997.
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