@article{10_1017_S0008439500028666,
     author = {Okubo, T.},
     title = {Variational {Principles,} by {B.} {L.} {Moiseiwitsch.} {Interscience} {Monographs,} {Vol.} {XX.} {Wiley,} {NewYork,} 1966. x + 310 pages. $14.00.},
     journal = {Canadian mathematical bulletin},
     pages = {623--624},
     year = {1967},
     volume = {10},
     number = {4},
     doi = {10.1017/S0008439500028666},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500028666/}
}