Teoria de circuits: diferència entre les revisions

<ref name=patimg2>{{citar web |url= http://patimg2.uspto.gov/.piw?Docid=02292387&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO2%2526Sect2%3DHITOFF%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsearch-bool.html%2526r%3D1%2526f%3DG%2526l%3D50%2526co1%3DAND%2526d%3DPALL%2526s1%3D2,292,387.PN.%2526OS%3DPN%2F2,292,387%2526RS%3DPN%2F2,292,387&PageNum=&Rtype=&SectionNum=&idkey=NONE&Input=View+first+page |títol=U. S. Patent 3,265,973 }}</ref>

<ref name=Robert>{{citar llibre|author=Robert Boylestad |title= Introducción al análisis de circuitos |publisher=Prentice Hall |year=2004 |isbn=970-26-0448-6 |edition= Desena edició |page=268 |url=http://books.google.com/books?id=fd-PRcPpf_EC&printsec=frontcover&dq=analisis+de+circuitos&hl=ca&ei=h6mVTsCuMcmV8QPV0LSfBw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCsQ6AEwAA#v=onepage&q&f=false}}</ref>

}}