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Twenty years of functional near-infrared spectroscopy: introduction for the special issue

EngineeringInfrared SensorInfrared TechnologyOptical PropertiesSpectroscopyApplied PhysicsLaser SpectroscopyFunctional Near-infrared SpectroscopyNatural SciencesInfrared SpectroscopyNear-infrared SpectroscopyChemistrySpecial IssueMolecular SpectroscopySpectroscopic MethodInfrared Systems