On collections of domains inscribed in a covering of a space in the sense of Alexandroff and Urysohn Worrell, J.M. jr. — 1967 Portugaliae mathematica
The closed continuous images of metacompact topological spaces Worrell, J.M. jr. — 1966 Portugaliae mathematica
Upper semicontinuous decompositions of spaces having bases of countable order Worrell, J.M. jr. — 1967 Portugaliae mathematica