@article{ZNSL_2019_485_a10,
     author = {A. A. Salatich and S. Yu. Slavyanov and O. L. Stesik},
     title = {Systems of first order {ODE} generating confluent {Heun} equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {187--194},
     publisher = {mathdoc},
     volume = {485},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2019_485_a10/}
}