Judgment of the Court of 17 September 2002 in Case C-513/99 (Reference for a preliminary ruling from the Korkein hallinto-oikeus): Concordia Bus Finland Oy Ab v Helsingin kaupunki, HKL-Bussiliikenne (Public service contracts in the transport sector — Directives 92/50/EEC and 93/38/EEC — Contracting municipality which organises bus transport services and an economically independent entity of which participates in the tender procedure as a tenderer — Taking into account of criteria relating to the protection of the environment to determine the economically most advantageous tender — Whether permissible when the municipal entity which is tendering meets those criteria more easily)