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Publications prior to 2004
GOTTARDI G, HOULSBY G.T., BUTTERFIELD R. (1999). Plastic response of circular footings on sand under general planar loading. GEOTECHNIQUE, vol. 49, p. 453-469, ISSN: 0016-8505
BUTTERFIELD R., HOULSBY G.T., GOTTARDI G (1997). Standardised sign conventions and notation for generally loaded foundations. GEOTECHNIQUE, vol. 47, p. 1051-1054, ISSN: 0016-8505
GOTTARDI G, BUTTERFIELD R. (1995). Displacement of a model rigid surface footing on dense sand under general planar loading. SOILS AND FOUNDATIONS, vol. 35, p. 71-82, ISSN: 0038-0806
BUTTERFIELD R., GOTTARDI G (1994). A complete three-dimensional failure envelope for shallow footings on sand. GEOTECHNIQUE, vol. 44, p. 181-184, ISSN: 0016-8505
GOTTARDI G, BUTTERFIELD R. (1993). On the bearing capacity of surface footings on sand under general planar loads. SOILS AND FOUNDATIONS, vol. 33, p. 68-79, ISSN: 0038-0806
