1. Measure and area;Bulletin of the American Mathematical Society;1952
2. Sopra una forma più ampia del problema di Cauchy per l'equazionep=f(x, y, z, q);Annali di Matematica Pura ed Applicata;1951-12
3. Topological methods in the theory of Lebesgue area;Bulletin of the American Mathematical Society;1950
4. The essential part of a surface;Bulletin of the American Mathematical Society;1947
5. On the definition of the essential multiplicity for continuous transformations in the plane;Transactions of the American Mathematical Society;1947