@article{ZNSL_2005_323_a0,
     author = {Yu. A. Alpin and Kh. D. Ikramov},
     title = {Unitary similarity of algebras generated by pairs of orthoprojectors},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {5--14},
     publisher = {mathdoc},
     volume = {323},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_323_a0/}
}