@article{ZNSL_2014_426_a4,
     author = {A. Ya. Kazakov},
     title = {Integral symmetry for the confluent {Heun} equation with added apparent singularity},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {34--48},
     publisher = {mathdoc},
     volume = {426},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2014_426_a4/}
}