4Smits G. Effect of cellsize reduction on polyurethane foam physical properties [ J ]. Journal of Thermal Insulation and Building Envelopes, 1994,17:309 - 330.
5Smits G. Effect of cellsize reduction on polyurethane foam physical properties [ J ]. Journal of Thermal Insulation and Building Envelopes, 1994, 17 : 309 - 330.