@article{10_1017_S001708950300140X,
     author = {GONZ\'ALEZ, MANUEL and MART\'INEZ-ABEJ\'ON, ANTONIO},
     title = {ULTRAPOWERS {AND} {SUBSPACES} {OF} {THE} {DUAL} {OF} {A} {BANACH} {SPACE}},
     journal = {Glasgow mathematical journal},
     pages = {493--501},
     year = {2003},
     volume = {45},
     number = {3},
     doi = {10.1017/S001708950300140X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950300140X/}
}