1 Lunine J I. Chem . E ng. New s. , 1995; 73(3) : 40~522 Wagne Richard P. NAT O AS I S er . Ser . , 1994; 21: 1~203 S toff ler D. Planet . Sp ace Sci . , 1995; 43(3/ 4)4 Roush Ted L, Cruikshan k Kale P, Ow en T obias C. AIP Conf . Proc . , 1995; 341: 143~153