There are simply too many plant foods that can serve as substantial contributors of protein to a meal plan. (whfoods.com)
The most substantial contributors here were the British artist and theorist Roy Ascott with his essay «Behaviourist Art and the Cybernetic Vision» in the journal Cybernetica (1966 — 67), and the American critic and theorist Jack Burnham. (en.wikipedia.org)
Other substantial contributors on hand included Jim Elkins Jr., Jean Stein, Susan and François de Menil, Lea and Andrew Faston, Bill Hill, Nancy Allen, Mary Lawrence Porter and Michael Zilkha. (chron.com)