1. Communication of flame through cylindrical channels;Wolfhard;Rep. Invest. U.S. Bur. Min. No. 5457,1959
2. Suppression and transmission of explosions by cylindrical channels;Wolfhard;Rep. Invest. U.S. Bur. Min. No. 5945,1959
3. Litchfield, E. L. and Blanc, M. V. Unpublished measurements at the Bureau of Mines