@inproceedings{inproceedings, title  = {{Passive optical methods for helmet tracking in aircraft}},

 publisher = {{SPIE}},

 url = {{https://doi.org/10.1117/12.543243 }},

 year = {{2004}},

 month = {{4}},

 author = {{Vitarius PJ and Gregory DA and Morell D}},

 doi = {{10.1117/12.543243}},

 volume = {{5437}},

 journal = {{SPIE Proceedings}},

 pages = {{223-223}},

 note = {{Accessed on 2026/02/04}}}