@article{YJOR_2000_10_1_a1,
     author = {Dimiter Ivanchev},
     title = {Finding the k {Most} {Vital} {Elements} of an s-t {Planar} {Directed} {Network}},
     journal = {Yugoslav journal of operations research},
     pages = {13 },
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {2000},
     zbl = {0997.90009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/YJOR_2000_10_1_a1/}
}