(Tokyo)Symposium(International)on Rockets and Astronautics Symposium(International)on Rockets and Astronautics (Tokyo)International Symposium on Rockets and Astronautics (Madison)Symposium(International)on Combustion 6th symposium(internation)on combustion 8th symposium(internation)on combustion Symposium(International)on Combustion International Congress on Astronautics Symposium (international) on Combustion .