INTEGRAL observations of the bright quasar 3C 273. Courvoisier, T.J.-L; Türler, M; Chernyakova, M; Favre, P; Walter, R; Deluit, S; Staubert, R; Stuhlinger, M; Tornikoski, M; Valtaoja, E; Bourban, G; Robson, I. European Space Agency, (Special Publication) ESA SP 2004