@article{10_1017_S0008439500030782,
     author = {Sen, D.K.},
     title = {Formalisme {Lagrangien} et {Lois} de {Sym\'etrie,} par {M.} {Gourdin.} {Gordon} and {Breach,} {Paris,} 150 {Fifth} {Avenue,} {New} {York,} 1968. vii + 99 pages. {Cloth:} {U.S.} $l0 (prepaid U.S. $8); paper: {U.S.} $6 (prepaid U.S. $4.80).},
     journal = {Canadian mathematical bulletin},
     pages = {535--535},
     year = {1969},
     volume = {12},
     number = {4},
     doi = {10.1017/S0008439500030782},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500030782/}
}