@article{10_1017_S0008439500031994,
     author = {Petersen, Gordon M.},
     title = {Diophantine {Approximations,} by {Ivan} {Niven.} {Interscience} {Tracts} in {Pure} and {Applied} {Mathematics,} {No.} 14. {Wiley,} {New} {York} - {London,} 1963. viii + 68 pages. $5.00.},
     journal = {Canadian mathematical bulletin},
     pages = {487--487},
     year = {1964},
     volume = {7},
     number = {3},
     doi = {10.1017/S0008439500031994},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0008439500031994/}
}