Quizá quiso decir: MathȨmatiques & Applications, 1154-483X ; 48 Letras ; 48. Letras ; 48. Instituto de Investigaciones Jurídicas, Serie Doctrina jurídica , no. 483 Sepan cuantos..." no. 488 Sepan cuantos..." no. 488 Colección Popular no. 488 Signals and Communication Technology, 1860-4862 Subcellular Biochemistry, 0306-0225 ; 48 Signals and Communication Technology, 1860-4862 Topics in Regulatory Economics and Policy ; 48 Signals and Communication Technology, 1860-4862 Springer Series on Signals and Communication Technology, 1860-4862 Research Issues in Real Estate, 1382-4848 ; 10 NATO Science Series, Series IV: Earth and Environmental Series, 1568-1238 ; 48 Focus on Structural Biology, 1571-4853 ; 5 Focus on Structural Biology, 1571-4853 ; 4 The Economics of Non-Market Goods and Resources, 1571-487X ; 6 The Economics of Non-Market Goods and Resources, 1571-487X ; 8 The Economics of Non-Market Goods and Resources, 1571-487X ; 7