On a Problem of Boone.
On recursive measure of classes of recursive sets
On reducibility of partial recursive functions.
On resemblance and recursive isomorphism types of bounded partial recursive functions.
On some properties of -maximal sets and -reducibility.
On the Degrees of Universal Regressive Isols.
On the form of functions which preserve regressive isols
On the relation of -reducibility between admissible sets.
Optimal bounds for ordinal comparison maps.