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[2]
BARR SW, UNPUBLISHED
[3]
CHANG N, UNPUBLISHED
[4]
DIMOPOULOS L, 1979, PHYS LETT B, V81, P416
[5]
DIMOPOULOS L, 1978, PHYS REV D, V18, P4500
[7]
ELLIS J, 1979, PHYS LETT B, V82, pE464