Understanding Line Drawings of Scenes with Shadows

@incollection{linedrawings-pcv1975,
   apice = {LinedrawingsPcv1975},
   author = {David L. Waltz},
   booktitle = {The Psychology of Computer Vision},
   editor = {Patrick Henry Winston},
   isbn13 = {978-0-07-071048-6},
   location = {New York, NY, USA},
   numpages = 73,
   pages = {19--91},
   publisher = {McGraw-Hill},
   title = {Understanding Line Drawings of Scenes with Shadows},
   year = 1975
}