@article{IVM_2020_12_a3,
     author = {V. Kh. Salikhov and M. G. Bashmakova},
     title = {On irrationality measure of some values of $\arctan \frac{1}{n}$},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {32--40},
     publisher = {mathdoc},
     number = {12},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2020_12_a3/}
}