@article{UFA_2015_7_2_a1,
     author = {R. A. Bashmakov and A. A. Makhota and K. V. Trounov},
     title = {On absence conditions  of unconditional bases of exponents},
     journal = {Ufa mathematical journal},
     pages = {17--32},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2015_7_2_a1/}
}