. "Preaspiration in the Nordic languages : synchronic and diachronic aspects / Pétur Helgason, 2002. - . - Bibliothèque royale, Suède. - http://regina.kb.se. - 2005-06-07"@fr . "0000000052207717" . . . . . "2013-08-02"^^ . . . "Pétur Helgason"@fr . "Linguiste"@fr . "VIAF" . "2013-08-02" . "Pétur Helgason" . . . . . . "1965"^^ . "male" . "2005-06-07" . "Linguiste" . . . "14635350"^^ . "Linguiste" . .