In 2015, Virginia Anderson gave an invited paper for the conference Christian Wolff at Orpheus, 28 and 29 September, a conference celebrating the work of the New York School composer Christian Wolff, with Wolff in attendance. You can read reports of the event here: http://experimentalmusic.co.uk/wp/news-from-ghent/
Today, Virginia Anderson has uploaded that paper, as read, on her Academia.edu page, here: https://www.academia.edu/31737395/Christian_Wolff_in_Interview
In this paper Virginia discusses an interview the American composer Barney Childs took with Wolff in 1972, especially about his then-new piece, Burdocks (1971), and the Scratch Orchestra performance he saw in London at Cecil Sharp House that year.