Species Ptychatractus

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^ ptychatractus ligatus (mighels & c.b. adams, 1842).  retrieved through: world register of marine species on 29 april 2010.
^ ptychatractus occidentalis stearns, 1873.  retrieved through: world register of marine species on 29 april 2010.
^ ptychatractus youngi kilburn, 1975.  retrieved through: world register of marine species on 29 april 2010.






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^ j. w. davies , a. o. morris, schur multiplier of generalized symmetric group , j. london math. soc (2), 8, (1974), pp. 615-620 ^ p. graczyk, g. letac , h. massam, hyperoctahedral group, symmetric group representations , moments of real wishart distribution , j. theoret. probab. 18 (2005), no. 1, 1-42. ^ joseph j. rotman, introduction theory of groups, p. 176 (1995) ^ l. kaloujnine, la structure des p-groupes de sylow des groupes symétriques finis , annales scientifiques de l École normale supérieure. troisième série 65, pp. 239–276 (1948)
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