Ishida, K.; Othman, M. (1988). «Surface distribution of M stars with different IRAS colour». Astrophysics and Space Science148 (2): 239. Bibcode:1988Ap&SS.148..239I. doi:10.1007/BF00645963.
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Ishida, K.; Othman, M. (1988). «Surface distribution of M stars with different IRAS colour». Astrophysics and Space Science148 (2): 239. Bibcode:1988Ap&SS.148..239I. doi:10.1007/BF00645963.