no. 2
The defect of weak approximation for homogeneous spaces
Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 8 (1999) no. 2, pp. 219-233. 
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     title = {The defect of weak approximation for homogeneous spaces},
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Borovoi, Mikhail. The defect of weak approximation for homogeneous spaces. Annales de la Faculté des sciences de Toulouse : Mathématiques, Série 6, Tome 8 (1999) no. 2, pp. 219-233. http://www.numdam.org/item/AFST_1999_6_8_2_219_0/

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