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CANIZARES CR, UNPUBLISHED
[5]
DAVIDSEN A, 1975, IAU2824 CIRC
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DOXSEY RE, 1975, IAU2730 CIRC
[8]
GRINDLAY J, 1978, IAU3230 CIRC
[10]
HACKWELL JA, 1979, IAU3331 CIRC