SFD® TECHNOLOGYSFD®Technology Application of the SFD®Method SFD®Output Data Geophysical Exploration Methods The Science of SFD® Library of Technical References NXT Technical Presentation Library of Technical References NXT has compiled a library of independent research and scientific / technical papers which are useful references related to general theories of physics, quantum mechanics, and the concept of stress in the earth’s subsurface. Summary of Relevant References Download Now