@article{10_4064_ap_51_1_141_145,
     author = {Robert J. Elliott and Michael Kohlmann and Jack W. Macki},
     title = {A proof of the minimum principle using flows},
     journal = {Annales Polonici Mathematici},
     pages = {141--145},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1990},
     doi = {10.4064/ap-51-1-141-145},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-51-1-141-145/}
}