@article{TMF_2007_150_2_a11,
     author = {H. Frahm and G. Palacios},
     title = {Integrable {Anderson-type} impurity in the~supersymmetric $t$--$J$ model},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {338--352},
     publisher = {mathdoc},
     volume = {150},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2007_150_2_a11/}
}