Vieira Da Silva: The Quest for Unknown Space | ,Bonhams : Bonhams Magazine | Invisible citiesMaria Vieira da Silva painted the metropolis – but they are cities of the mind more than the eye, says Rachel Spencer,Vieira Da Silva: The Quest for Unknown Space | ,Maria Helena Viera da Silva - Biography | Galerie Boulakia,Life and work: Maria Helena Vieira da Silva | P55.ART