@article{PFMT_2015_4_a1,
     author = {S. S. Girgel},
     title = {Generalized {Bessel--Gaussian} beams of continuous order},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {11--15},
     publisher = {mathdoc},
     number = {4},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2015_4_a1/}
}