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2. Konfliktsteele Fussgängersstreifen;Camenzind;Zeitschrift für Verkehrssicherheit,1978
3. Major Engineering approaches toward increasing pedestrian safety;Fegan;Public Roads,1978
4. Gåendes säkerhet i trafiksignaler;Gårder,1982
5. Warrants for zebra and pelican crossings using a minimum waiting cost criterion;Griffiths;Traffic Engng and Control,1976