@article{ARM_2008__44_5_a2,
     author = {Crowley, Diarmuid J. and Zvengrowski, Peter D.},
     title = {On the non-invariance of span and immersion co-dimension for manifolds},
     journal = {Archivum mathematicum},
     pages = {353--365},
     publisher = {mathdoc},
     volume = {44},
     number = {5},
     year = {2008},
     mrnumber = {2501571},
     zbl = {1212.57009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2008__44_5_a2/}
}