Research on the Safe Lighting of Minor Radius Curve Spiral Tunnels Fu, Li Xin ; Ren, Hui ; Wang, Jian Hua ; Zhang, Tian Le Abstract Publication: Applied Mechanics and Materials Pub Date: September 2011 DOI: 10.4028/www.scientific.net/AMM.99-100.358 Bibcode: 2011AMM....99..358F