(en) Dieter J. Haas, « Productive efficiency of English football teams—a data envelopment analysis approach », Managerial and Decision Economics, Wiley Online Library, vol. 24, no 5, , p. 403-410 (DOI10.1002/mde.1105, lire en ligne, consulté le ).
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(en) Dieter J. Haas, « Productive efficiency of English football teams—a data envelopment analysis approach », Managerial and Decision Economics, Wiley Online Library, vol. 24, no 5, , p. 403-410 (DOI10.1002/mde.1105, lire en ligne, consulté le ).