Geodesic
The Periodicity of Residuals $\Delta_{\varphi}$ and $\Delta \theta$ of The Double Star ADS 11520
Publications of the Department of Astronomy, Tome 11 (1981) no. 1.

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The periodical variations of the residuals of radius $(O-C)_\varphi$ and positional angle $(O-C)_\theta$ of double star ADS 11520 was remarked. From the observations made in period 1990-1976 the corrections of Van den Bossś orbital elements are computed and it is shown that the periodical variations of residuals relative to the new orbital elements exist. 
@article{PDA_1981_11_1_a1,
     author = {D. Olevi\'c and D. Djurovi\'c},
     title = {The {Periodicity} of {Residuals} $\Delta_{\varphi}$ and $\Delta \theta$ of {The} {Double} {Star} {ADS} 11520},
     journal = {Publications of the Department of Astronomy},
     pages = {15 - 18},
     publisher = {mathdoc},
     volume = {11},
     number = {1},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/PDA_1981_11_1_a1/}
}
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D. Olević; D. Djurović. The Periodicity of Residuals $\Delta_{\varphi}$ and $\Delta \theta$ of The Double Star ADS 11520. Publications of the Department of Astronomy, Tome 11 (1981) no. 1. http://geodesic.mathdoc.fr/item/PDA_1981_11_1_a1/