informing of the dates and site of the conference,the social program, and the Program Committee membership

on the PST WG activities in 1982

of the PST WG activities for 1983

on the PST WG activities in 1983

of the PST WG activities for 1984

on the PST WG activities in 1984

of the PST WG activities for 1985

of the PST WG activities for 1986

on the PST WG activities in 1986

of the PST WG activities for 1987

on the PST WG activities in 1987

of the joint session of PLI and PST work groups (November 1-2, 1984, Novosibirsk)