@article{VMUMM_1992_6_a11,
     author = {N. I. Fel'dman},
     title = {Simultaneous approximations of logarithms of algebraic numbers and the number $\pi$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {47--50},
     year = {1992},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1992_6_a11/}
}