kw.\*:("VALIDITE METHODE")
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A DISCUSSION OF EXTERNAL VALIDITY IN SYSTEMIC RESEARCHLUSK EJ; WRIGHT H.1982; J. APPL. SYST. ANAL.; ISSN 0308-9541; GBR; DA. 1982; VOL. 9; PP. 57-66; BIBL. 11 REF.Article