Fillmore, Jay P.; Springer, Arthur (1995-03-01). "New euclidean theorems by the use of Laguerre transformations — Some geometry of Minkowski (2+1)-space". Journal of Geometry. 52 (1): 74–90. doi:10.1007/BF01406828. ISSN1420-8997. S2CID122511184.
Fillmore, Jay P.; Springer, Arthur (1995-03-01). "New euclidean theorems by the use of Laguerre transformations — Some geometry of Minkowski (2+1)-space". Journal of Geometry. 52 (1): 74–90. doi:10.1007/BF01406828. ISSN1420-8997. S2CID122511184.
Fillmore, Jay P.; Springer, Arthur (1995-03-01). "New euclidean theorems by the use of Laguerre transformations — Some geometry of Minkowski (2+1)-space". Journal of Geometry. 52 (1): 74–90. doi:10.1007/BF01406828. ISSN1420-8997. S2CID122511184.