[1] UNIV FRANKFURT,INST THEORET PHYS,D-6000 FRANKFURT 70,FED REP GER
[2] MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824
[3] MICHIGAN STATE UNIV,NATL SUPERCONDUCTING CYCLOTRON LAB,E LANSING,MI 48824
[4] UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801