@article{DAN_1987_293_3_a1,
     author = {I. M. Gel'fand and B. V. Lidskii and V. A. Ponomarev},
     title = {Preprojective reduction of the free modular lattice $D^r$},
     journal = {Doklady Akademii Nauk},
     pages = {524--528},
     publisher = {mathdoc},
     volume = {293},
     number = {3},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_293_3_a1/}
}