@article{JSFU_2014_7_1_a9,
     author = {Chris W. Parker and Atapattu A. C. Kanchana},
     title = {Examples of groups with the same number of subgroups of every index},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {95--99},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2014},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2014_7_1_a9/}
}