Publication Type:Journal Article Year of Publication:1978 Authors:M. LastraMenéndez, J.J.&MayorLópez Journal:Rev. Fac. Ci. Univ. OviedoRev. Fac. Ci. Univ. Oviedo Volume:17-19 Pagination:309-315 Add new commentGoogle ScholarBibTeXRTFMARCEndNote XMLRIS