Behaviour of high temperature alloys in aggressive environments proceedings of the Petten internat. conference ; conference organized by the Bond voor Materialenkennis, The Hague, The Netherlands, Commission of the Europ. Communities, Joint Research Centre, Petten Establishment, The Netherlands, and held at the JRC Petten Establishment, Petten (Ntt), The Netherlands on 15 - 18 Oct., 1979 (Metals Soc., 1980)