H. Langman
发表
Paul Erdös,
Richard Bellman,
Victor Thebault,
1943
.
Azriel Rosenfeld,
Harley Flanders,
D. L. Silverman,
1964
.
Harry Langman,
V. Thebault,
J. H. M. Wedderbur,
1934
.
Nathan Altshiller-Court,
S. A. Corey,
R. M. Mathews,
1924
.
J. Rosenbaum,
Nathan Altshiller-Court,
V. M. Spunar,
1925
.