They may have been referring to something like this: http://cepa.stanford.edu/sites/default/files/ednext20064_68.pdf http://cepa.stanford.edu/sites/default/fil

They may have been referring to something like this: http://cepa.stanford.edu/sites/default/files/ednext20064_68.pdf http://cepa.stanford.edu/sites/default/files/ednext20064_68....