  
  
  [1XReferences[101X
  
  [[20XBur11[120X]  [16XBurnside,  W.[116X,  [17XTheory  of  groups  of finite order[117X, The University
  Press, Second edition (1911), 461-462, Chapter Chapter Note A.
  
  [[20XKos74[120X]  [16XKosvintsev,  L. F.[116X, [17XOver the theory of groups with properties given
  over  the  centralizers  of  involutions[117X, [18XSverdlovsk (Ural.), Summary thesis
  Doct[118X (1974).
  
  [[20XLan03[120X]  [16XLandau,  E.[116X,  [17XÜber die Klassenzahl der binären quadratischen Formen
  von negativer Discriminante[117X, [18XMath. Ann.[118X, [19X56[119X, 4 (1903), 671-676.
  
  [[20XMil11[120X]  [16XMiller,  G.  A.[116X,  [17XGroups  involving  only a small number of sets of
  conjugate operators[117X, [18XArch. der Math. u. Phys.[118X, [19X17[119X (1911), 199-204.
  
  [[20XOS76[120X]  [16XOdincov, V. A. and Starostin, A. I.[116X, [17XFinite groups with 9 classes of
  conjugate elements[117X, [18XUral. Gos. Univ. Mat. Zap.[118X, [19X10[119X (1976), 114-134.
  
  [[20XPol68[120X]  [16XPoland, J.[116X, [17XFinite Groups with a given Number of Conjugate Classes[117X,
  [18XCanadian J. Math.[118X, [19X20[119X (1968), 456-464.
  
  [[20XVLS07[120X]  [16XVera  López,  A. and Sangroniz, J.[116X, [17XThe finite groups with thirteen
  and fourteen conjugacy classes[117X, [18XMath. Nachr.[118X, [19X280[119X, 5-6 (2007), 676-694.
  
  [[20XVLVL85[120X]  [16XVera López, A. and Vera López, J.[116X, [17XClassification of finite groups
  according  to  the number of conjugacy classes[117X, [18XIsr. J. Math.[118X, [19X51[119X, 4 (1985),
  305-338.
  
  [[20XVLVL86[120X]  [16XVera López, A. and Vera López, J.[116X, [17XClassification of finite groups
  according  to  the  number  of  conjugacy  classes  II[117X, [18XIsr. J. Math.[118X, [19X56[119X, 2
  (1986), 188-221.
  
  
  
  [32X
