"Ingham inquality"@en . "Crit\u00E8re de Kalman"@fr . . "Karine Mauffrey" . <177560304> . "Karine" . "Op\u00E9rateur d'ordre mixte"@fr . "Mixed order operator"@en . "In\u00E9galit\u00E9 de Ingham"@fr . "Mauffrey" . "Syst\u00E8me parabolique"@fr . "In\u00E9galit\u00E9 de Carleman"@fr . "Essential spectrum"@en . . "Spectre essentiel"@fr . "Contr\u00F4labilit\u00E9"@fr . "Observability"@en . "Controllabiolity"@en . "Observabilit\u00E9"@fr . "Kalman rank condition"@en .