@article{UFA_2017_9_3_a1,
     author = {F. G. Avkhadiev},
     title = {Estimates of {Hardy--Rellich} constants   for polyharmonic operators  and their generalizations},
     journal = {Ufa mathematical journal},
     pages = {8--17},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2017_9_3_a1/}
}