Adolph Bailoff, Earl D. West, William Hoover, J. C. Gregg, Eric Doolittle, Lecta Miller, J. F. W. Scheffer, Henry Heaton, Isaac L. Beverage, H. C. Whitaker
Adolph Bailoff, Earl D. West, William Hoover, J. C. Gregg, Eric Doolittle, Lecta Miller, J. F. W. Scheffer, Henry Heaton, Isaac L. Beverage, H. C. Whitaker. "Problems: 2-16." The American mathematical monthly 1.1 (1894) 23