Book Section

Buchholz, Wilfried (1992): A simplified version of local predicativity. In: Aczel, Peter and Simmons, Harold and Wainer, Stanley S. (eds.) , Proof theory. Leeds: Cambridge University Press. pp. 117-147

Schwichtenberg, Helmut and Wainer, Stanley S. (1975): Infinite terms and recursion in higher types. In: Diller, J. and Müller, G.H. (eds.) , Proof Theory Symposium Kiel 1974. Vol. 500. Berlin, Heidelberg, New York: Springer. pp. 341-364