@article{SIGMA_2018_14_a10,
     author = {Farrokh Atai and Edwin Langmann},
     title = {Series {Solutions} of the {Non-Stationary} {Heun} {Equation}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2018},
     volume = {14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2018_14_a10/}
}