https://catalogue-scientifique.canada.ca/record=1538653~S6*frc
Rechercher Great Britain. Dept. of Trade and Industry; Rechercher Great Britain. Dept. of Prices and Consumer Protection; Rechercher AT&T Istel; Rechercher Great Britain. Dept. of Energy; Rechercher Great Britain. Dept. of Trade; Rechercher Great Britain. Dept. of Industry
DTI, 1992
Publication gouvernementale