@article{10_4064_fm_69_3_227_231,
     author = {Mehdi Behzad and Gary Chartrand and Curtiss Wall},
     title = {On minimal regular digraphs with given girth},
     journal = {Fundamenta Mathematicae},
     pages = {227--231},
     publisher = {mathdoc},
     volume = {69},
     number = {3},
     year = {1970},
     doi = {10.4064/fm-69-3-227-231},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-69-3-227-231/}
}