共 21 条
[6]
HILDNER E, 1977, STUDY TRAVELLING INT, P6
[7]
HOWARD RA, 1975, UAG48 NOAA WORLD REP
[8]
KELLER CF, 1981, B AAS, V12, P918
[9]
MACQUEEN RM, 1974, AP J, V187, P185