. . "Psychische functies." . . "Institute for Perception R.V.O.-T.N.O." . . "Akustyka." . . "Rijksuniversiteit te Utrecht." . . "Toonwaarneming." . . "Perception de la musique." . . "Pitch Discrimination." . . "Hearing." . . . "Experiments on tone perception" . "Experiments on tone perception"@en . . . "Experiments on tone perception. Proefschrift, etc. [With summaries in French, German and Dutch, and with a gramophone record.]"@en . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Sound." . . "Trillingsleer." . .