Quizá quiso decir: Serendipity ; 67 International Series in Quantitative Marketing, 0923-6716 ; 17 Massive Computing, 0924-6703 ; 5 Massive Computing, 0924-6703 ; 6 International Series in Quantitative Marketing, 0923-6716 ; 18 Progress in Nonlinear Differential Equations and Their Applications ; 67 Issues in Business Ethics, 0925-6733 ; 19 Issues in Business Ethics, 0925-6733 ; 21 The Springer Series on Demographic Methods and Population Analysis, 1389-6784 ; 16 Issues in Business Ethics, 0925-6733 ; 22 Studies in Natural Language and Linguistic Theory, 0924-4670 ; 67 NATO Science Series, 1568-1238 ; 67 Issues in Business Ethics, 0925-6733 ; 23 The Springer Series On Demographic Methods And Population Analysis, 1389-6784 ; 17 Developments in Plant Breeding, 1381-673X ; 12 Demographic Methods and Population Analysis, 1389-6784 ; 18 The Springer Series on Demographic Methods and Population Analysis, 1389-6784 ; 19 Demographic Methods and Population Analysis, 1389-6784 ; 20 The Springer Series On Demographic Methods and Population Analysis, 1389-6784 ; 21 Issues in Business Ethics, 0925-6733 ; 24