@article{SM_2006_197_6_a1,
     author = {A. M. Gaisin},
     title = {Properties of series of exponentials whose exponents satisfy to 
},
     journal = {Sbornik. Mathematics},
     pages = {813--833},
     publisher = {mathdoc},
     volume = {197},
     number = {6},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_6_a1/}
}