@article{10_4153_CMB_2003_013_4,
     author = {Petersen, Peter and Wilhelm, Frederick},
     title = {On {Frankel{\textquoteright}s} {Theorem}},
     journal = {Canadian mathematical bulletin},
     pages = {130--139},
     year = {2003},
     volume = {46},
     number = {1},
     doi = {10.4153/CMB-2003-013-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-013-4/}
}