@article{10_4153_CJM_1980_028_5,
     author = {Borwein, Peter},
     title = {Inequalities and {Inverse} {Theorems} in {Restricted} {Rational} {Approximation} {Theory}},
     journal = {Canadian journal of mathematics},
     pages = {354--361},
     year = {1980},
     volume = {32},
     number = {2},
     doi = {10.4153/CJM-1980-028-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-028-5/}
}