@techreport {TR-1985-008,
   type = {Technical Report},
   author = {Kent Stevens, Allen Brookes },
   title = {The Concave Cusp as a Determiner of Figure-Ground},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1985-008,
   year = 1985,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1985-008.pdf}},
}