@article{TMF_2020_202_2_a2,
     author = {Cheng Zhang and Linyu Peng and Da-jun Zhang},
     title = {Discrete {Crum's} theorems and lattice {KdV-type} equations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {187--206},
     publisher = {mathdoc},
     volume = {202},
     number = {2},
     year = {2020},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2020_202_2_a2/}
}