Links importantes:
http://www.bibliocatalogo.buap.mx:2261/pdf18_21/pdf/1954/BAS/01Mar54/21307286.pdf?T=P&P=AN&K=21307286&S=R&D=a9h&EbscoContent=dGJyMNLe80SeprY4y9fwOLCmr0qep7NSr6e4TbKWxWXS&ContentCustomer=dGJyMPGsrkmwrbROuePfgeyx43zx
http://www.ucm.es/info/sdrelint/lib1cap15.pdf
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