- Epsteen, Monthly, June-July, 1904, p. 132.
- Dr. Zerr adds the remark that this will occur again in 1916 and 2000.
- Dr. Hoover obtains the obvions line y=0, but not the ones of the published solution. Dr. Safford's fortunate choice of c for absolute term in the assumed line excludes the line y=0 from his result. A perfectly general method would furnish a singly infinite family of lines only the above three of which are real. An investigation of this family for, say the general nodal-circular quartic, ought to lead to some interesting results. Ed. G.
The American Mathematical Monthly
Volume 12, 1905 - Issue 8-9