Titlebook: Viscoelastic Substances; Karl Hoffmann,Otto Hockwin Conference proceedings 1990Latest edition Springer-Verlag Berlin Heidelberg 1990 amyot

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Introduction, force in 1970. The NPT is not of indefinite duration. Twenty-five years after its entry into force, as provided in Article X.2 of the treaty, a conference must be convened in 1995 to decide whether it will continue indefinitely or be extended for an additional fixed period or periods of time.