@article{CMH_1972__47_139513,
     author = {George Maxwell},
     title = {Infinite {Symplectic} {Groups} over {Rings}},
     journal = {Commentarii mathematici Helvetici},
     pages = {254--259},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0234.20022},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139513/}
}