@article{UFA_2013_5_3_a1,
     author = {F. Kh. Baichorova and Z. S. Elkanova},
     title = {Commuting differential operators of orders~4 and~6},
     journal = {Ufa mathematical journal},
     pages = {11--19},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2013_5_3_a1/}
}