On the redshifts of the BL Lac 3FGL J0909.0+2310 and its close companion

1. Rosa-González, D.
2. de León, S.C.
3. Mayya, Y.D.
4. Carramiñana, A.
5. Aretxaga, I.
6. González, J.B.
7. Furniss, A.
8. Terlevich, E.
9. Vega, O.
10. Méndez-Abreu, J.
11. León Tavares, J.
12. Longinotti, A.L.
13. Terlevich, R.