@misc {MATHEDUC.02404950,
    author       = {Shaughnessy, J.M. and Burger, W.F.},
    title        = {Spadework prior to deduction in geometry. Meetkundig onderzoek komt eerst. Geometrische Untersuchungen sind zuerst dran.},
    howpublished = {Euclides. (Nov 1991) v. 67(3) p. 70-79. [ISSN 0165-0393]},
    year         = {1991},
    msc2010      = {C30xx (G30xx G40xx D40xx)},
    identifier   = {1992d.02247},
}