[1] INST SPACE & ASTRONAUT SCI,TOKYO 153,JAPAN
[2] EUROPEAN SPACE AGCY,DEPT MED A,DIV COSM RAY,ESTEC,2200 AG NOORDWIJK,NETHERLANDS
[3] UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742
[4] NAGOYA UNIV,FAC SCI,COSM RAY RES LAB,NAGOYA,AICHI 464,JAPAN
[5] NATL LAB HIGH ENERGY PHYS,TSUKUBA,IBARAKI 305,JAPAN
[6] KOBE UNIV,DEPT PHYS,KOBE 657,JAPAN
[7] UNIV TOKYO,INST COSM RAY RES,TOKYO 188,JAPAN
[8] STANFORD UNIV,DEPT PHYS,STANFORD,CA 94035
[9] CNR,IST COSMOGEOFIS,TORINO,ITALY
[10] UNIV TOKYO,INST NUCL STUDY,TOKYO 188,JAPAN