@article{VTGU_2008_2_a1,
     author = {A. V. Arbit},
     title = {The {Lindel\"of} number is $fu$-invariant},
     journal = {Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika},
     pages = {10--19},
     publisher = {mathdoc},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VTGU_2008_2_a1/}
}