The G7/G8 system, c1999 p. 1-2 (The Group of Seven/Group of Eight (G7/G8); an informal organisation, with no rules or permanent secretariat staff; in Birmingham in 1998, the G7 became the G8, with Russia as a full mem.)
URL WWW.Library.utoronto.ca/g7/what₋is₋g7.html (1998 gave birth to the G8 (although the G7 continues to function along side the formal summits))