@article{10_4064_ap_2_2_314_318,
     author = {A. Pli\'s},
     title = {On the uniqueness of the non-negative solution of the homogeneous {Cauchy} problem for a system of partial differential equations},
     journal = {Annales Polonici Mathematici},
     pages = {314--318},
     publisher = {mathdoc},
     volume = {2},
     number = {2},
     year = {1955},
     doi = {10.4064/ap-2-2-314-318},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-2-2-314-318/}
}