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• Fujita, T.; Haga, H.
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  Safety Devices in the Kan-Etsu Tunnel.
  Highway Public Corp., Japan; Oki Electric Industry Co., Ltd., Japan
  University of Dundee and Independent Technical Conferences Ltd. Safety in Road and Rail Tunnels. First (1st) International Conference. November 23-25, 1992, Basel, Switzerland, Vardy, A. E., Editors, 587-601 p., 1992

• Nishimori, S.; Haga, H.
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  Fire Detector for Tunnels (CO₂ Resonance Flicker Type).
  Dasys Co., Ltd., Japan; Oki Electric Industry Co., Ltd., Japan
  University of Dundee and Independent Technical Conferences Ltd. Safety in Road and Rail Tunnels. International Conference, 2nd (Second). Proceedings. April 3-6, 1995, Granada, Spain, Vardy, A. E., Editors, 405-410 p., 1995