Categoricity in hyperarithmetical degreesC.J. Ash · 1987

Pairs of recursive structuresC.J. Ash; J.F. Knight · 1990

Labelling systems and R.E. structuresC.J. Ash · 1990

Ramified systemsC.J. Ash; J.F. Knight · 1994

Possible degrees in recursive copies IIC.J. Ash; J.F. Knight · 1997

Intersections of algebraically closed fieldsC.J. Ash; John W. Rosenthal · 1986

Stability of recursive structures in arithmetical degreesC.J. Ash · 1986

Optimal Hartmann sensing at low light levelsD.L. Ash; C.J. Solomon; G. Loos · 1998