Lorenz Halbeisen. Can Kirkman's Schoolgirls Walk Abreast by Forming Arithmetic Progressions?. The American Mathematical Monthly, 110(3):228-231, 2003. [doi]
@article{Halbeisen03-0,
title = {Can Kirkman's Schoolgirls Walk Abreast by Forming Arithmetic Progressions?},
author = {Lorenz Halbeisen},
year = {2003},
url = {http://www.jstor.org/stable/3647936},
researchr = {https://researchr.org/publication/Halbeisen03-0},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {110},
number = {3},
pages = {228-231},
}