@article{AM2_1976__14_136576,
     author = {Branko Gr\"unbaum and J. Malkevitch},
     title = {Pairs of edge-disjoint {Hamiltonian} circuits.},
     journal = {Aequationes mathematicae},
     pages = {191--196},
     publisher = {mathdoc},
     volume = {14},
     year = {1976},
     zbl = {0331.05118},
     url = {http://geodesic.mathdoc.fr/item/AM2_1976__14_136576/}
}