@article{10_1017_S0008439500030332,
     author = {Colton, David L.},
     title = {Perturbation {Methods} in {Applied} {Mathematics,} by {Julian} {D.} {Cole.} {Blaisdell} {Publishing} {Company,} {Waltham,} {Massachusetts,} 1968. 260 pages. {U.S.} $9.50.},
     journal = {Canadian mathematical bulletin},
     pages = {248--249},
     year = {1969},
     volume = {12},
     number = {2},
     doi = {10.1017/S0008439500030332},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500030332/}
}