Murty characterized the connected binary matroids with all circuits having the same size. Here we characterize the connected
bicircular matroids with all circuits having the same size.
Citation
Torina Lewis, Jenny Mcnulty, Nancy Ann Neudauer, Talmage James Reid, Laura Sheppardson. Bicircular Matroid Designs[J], Ars Combinatoria, Volume 110. 513-523. .