@techreport {TR-1988-011,
   type = {Technical Report},
   author = {Sarah Douglas },
   title = {Frame of Reference and the Representation of Commonsense Spatial Relations},
   institution = {University of Oregon, Computer and Information Sciences Department},
   number = TR-1988-011,
   month = 7,
   year = 1988,
   note = {Available at \url{https://www.cs.uoregon.edu/Reports/TR-1988-011.pdf}},
}