@article{10_4153_CMB_1965_035_x,
     author = {Beineke, Lowell W. and Harary, Frank},
     title = {The {Maximum} {Number} of {Strongly} {Connected} {Subtournaments*}},
     journal = {Canadian mathematical bulletin},
     pages = {491--498},
     year = {1965},
     volume = {8},
     number = {4},
     doi = {10.4153/CMB-1965-035-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-035-x/}
}