Nik Software original training -- Dfine Control Points Reduce Noise - YouTube
DFine - Nik Collection by DxO
Amazon.com: The Official Nik Software Image Enhancement Guide: The Photographer's Resource for Professional Workflow Techniques: 9780470287637: Bradley, Joshua D.: Books
Tutorial per Photoshop: Google Nik Collection
Google Nik Collection: Control Color Noise with Dfine - Corel Discovery Center