Olsen, Erik, “Scientists Uncover Invisible Motion in Video”, New York Times, February 27, 2013, http://bits.blogs.nytimes.com/2013/02/27/scientists-uncover-invisible-motion-in-video; Rubinstein, Michael, Eugene Shih, John Guttag, Frédo Durand, and William T. Freeman, “Eulerian Video Magnification for Revealing Subtle Changes in the World”, paper presented at the ACM Special Interest Group on Computer Graphics and Interactive Techniques, July 2012, http://people.csail.mit.edu/mrub/papers/vidmag.pdf.