Simion, Iulian IonTesterman, Donna2019-07-082019-07-082019-07-082014-04-0310.1007/978-81-322-1814-2_8https://infoscience.epfl.ch/handle/20.500.14299/158926Unipotent Overgroups in Simple Algebraic Groupstext::book/monograph::book part or chapter