2377 20160701171704.0 ASTROimport-534 Ruymaekers, G. 1997 Assessing Statistical Accuracy to the Orbital Elements of Visual Double Stars by Means of Bootstrap Cuypers, J. Statistical Challenges in Modern Astronomy II 1997 437 http://esoads.eso.org/abs/1997scma.conf..437R published in NONREF