SIMBAD references

1989MNRAS.240p..31C - Mon. Not. R. Astron. Soc., 240, part no 16, 31-34 (1989)

The optical light curve of PSR 1957+20.

CALLANAN P.J., CHARLES P.A. and VAN PARADIJS J.

Journal keyword(s):

Simbad objects: 1

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