@article{10_4153_CJM_1989_023_8,
     author = {Preiss, D. and Thomson, B. S.},
     title = {The {Approximate} {Symmetric} {Integral}},
     journal = {Canadian journal of mathematics},
     pages = {508--555},
     year = {1989},
     volume = {41},
     number = {3},
     doi = {10.4153/CJM-1989-023-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1989-023-8/}
}