@article{10_1017_S001708950200112X,
     author = {L\'OPEZ-POUSO, \'OSCAR},
     title = {COMPARISON {BETWEEN} {USUAL} {AND} {VECTOR} {TIME} {DERIVATIVES}},
     journal = {Glasgow mathematical journal},
     pages = {167--172},
     year = {2003},
     volume = {45},
     number = {1},
     doi = {10.1017/S001708950200112X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950200112X/}
}