https://catalogue-scientifique.canada.ca/record=1573630~S6*frc
Rechercher Commission of the European Communities. Directorate-General Information Technologies and Industries, and Telecommunications; Rechercher Commission of the European Communities. Directorate-General Telecommunications, Information Market, and Exploitation of Research; Rechercher Commission of the European Communities. Directorate-General for Energy; Rechercher Frigoscandia SpA
Commissione delle Comunità Europee, Direzione generale XIII, Tecnologie e industrie dell'informazione e telecomunicazioni, 1993, ISBN : 9789282652015
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