R. E. Gaines
发表
J. V. Uspensky,
Vladimir F. Ivanoff,
Albert A. Bennett,
1932
.
Martin Rosenman,
W. H. Rasche,
Nathan Altshiller-Court,
1932
.
R. E. Gaines,
J. K. Peterson,
J. Peterson,
1981
.
Paul Erdös,
Victor Thebault,
W. P. Udinski,
1935
.