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    Utilisation of security helmets for two-wheeled vehicle riders af Huijbers, J. J. W.

    Udgivet 1990
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  3. 3

    Use of the helmet retention systems in the Netherlands af Huijbers, J. J. W.

    Udgivet 1989
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  4. 4

    Safety helmets for pedal cyclists, a pilot study amongst children af Bennett, Marie

    Udgivet 1977
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  5. 5

    Costs and benefits arising if all motorcyclists wore safety helmets af Allsop, R. E.

    Udgivet 1967
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