@article{10_1017_S0017089500001518,
     author = {Williams, W. E.},
     title = {A note on integral equations},
     journal = {Glasgow mathematical journal},
     pages = {119--121},
     year = {1972},
     volume = {13},
     number = {2},
     doi = {10.1017/S0017089500001518},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001518/}
}