@article{10_37236_5237,
     author = {Luis H. Gallardo},
     title = {New duality operator for complex circulant matrices and a conjecture of {Ryser}},
     journal = {The electronic journal of combinatorics},
     year = {2016},
     volume = {23},
     number = {1},
     doi = {10.37236/5237},
     zbl = {1416.15027},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/5237/}
}