1960, Kgl. Danske Videnskab. Selskab, Mat.-Fys. Medd., 32
1960, Phys. Rev., 120, 957, 10.1103/PhysRev.120.957
1960, Phys. Rev., 118, 687, 10.1103/PhysRev.118.687
1960, Phys. Rev., 120, 2214, 10.1103/PhysRev.120.2214
1951, Ann. Math., 53, 36, 10.2307/1969342
1955, Ann. Math., 62, 548, 10.2307/1970079
1957, Ann. Math., 65, 203, 10.2307/1969956
1958, Ann. Math., 67, 325, 10.2307/1970008
1960, Suomalaisen Tiedeakat. Toimituksia, AVI
1960, Phys. Rev., 120, 1698, 10.1103/PhysRev.120.1698
1960, Nuclear Phys., 18, 395, 10.1016/0029-5582(60)90413-2
1960, Nuclear Phys., 18, 420, 10.1016/0029-5582(60)90414-4
1961, Nuclear Phys., 25, 447, 10.1016/0029-5582(61)90176-6
1956, Phys. Rev., 104, 483, 10.1103/PhysRev.104.483
1957, Nuclear Phys., 2, 575
1957, Ann. Math., 65, 203, 10.2307/1969956
1953, Phys. Rev., 89, 619, 10.1103/PhysRev.89.619
1952, Phys. Rev., 88, 101, 10.1103/PhysRev.88.101
1930, Proc. Acad. Sci. Amsterdam, 33, 959
1902, Proc. London Math. Soc., 34, 397
1891, Messenger of Math., 20, 79
1903, Proc. London Math. Soc., 35, 285
1907, Proc. Edinburgh Math. Soc., 25, 114
1948, Bell System Tech. J., 27, 379, 10.1002/j.1538-7305.1948.tb01338.x