@article{IM2_2018_82_3_a5,
     author = {M. Yu. Luchin and V. Kh. Salikhov},
     title = {Approximating $\ln 2$ by numbers in the field $\mathbb{Q}(\sqrt{2}\,)$},
     journal = {Izvestiya. Mathematics },
     pages = {549--577},
     publisher = {mathdoc},
     volume = {82},
     number = {3},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2018_82_3_a5/}
}