@article{SM_1972_18_2_a7,
     author = {V. S. Shulman},
     title = {Symmetric {Banach} algebras of operators in a~space of type $\Pi_1$},
     journal = {Sbornik. Mathematics},
     pages = {267--283},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {1972},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1972_18_2_a7/}
}