@article{RCM_1968__2_181561,
     author = {I. Jos\'e Nieto},
     title = {On comparsion of seminorms on a barrel},
     journal = {Revista colombiana de matematicas},
     pages = {124--128},
     publisher = {mathdoc},
     volume = {2},
     year = {1968},
     zbl = {0193.40803},
     url = {http://geodesic.mathdoc.fr/item/RCM_1968__2_181561/}
}