@techreport{ram-01-mult,
  author = {Lyle Ramshaw},
  title = {On Multiplying Points: {The} Paired Algebras of Forms and Sites},
  institution = {Hewlett-Packard Research Labs},
  number = {SRC-RR-169},
  year = 2001,
  month = may,
  comment = {Uses oriented projective geometry.},
  altkeys = {Citeseer:may-multiplying}
}