1. P.H. Thomas, The Movement of Buoyant Fluid against a Stream and the Venting of Underground Fires, Fire Research Station, Fire Research Notes 351, Borehamwood, 1958, p. 9.
2. P.H. Thomas, The Movement of Smoke in Horizontal Passages Against an Air Flow, Fire Research Station, Fire Research Notes 723, Borehamwood, 1968, p. 9.
3. N.H. Danziger, W.D. Kennedy, Longitudinal Ventilation Analysis for the Glenwood Canyon Tunnels, in: Proceedings of the Fourth International Symposium on the Aerodynamics & Ventilation of Vehicle Tunnels, BHRA Fluid Engineering, York, UK, 1982, pp. 169–186.
4. W.D. Kennedy, Critical velocity: Past, Present and Future, Seminar of Smoke and Critical Velocity in Tunnels, JFL Lowndes, London, 1996, pp. 305–322.
5. Control of smoke flow in tunnel fires;Oka;Fire Saf. J.,1995