Newman M. H. A.. The calculus of sets. Elements of the topology of plane sets of points, by Newman M. H. A., Cambridge University Press 1939, pp. 3–12.

@inproceedings{Church1939NewmanMH,
  title={Newman M. H. A.. The calculus of sets. Elements of the topology of plane sets of points, by Newman M. H. A., Cambridge University Press 1939, pp. 3–12.},
  author={Alonzo Church},
  year={1939}
}