@article{UZKU_2007_149_1_a16,
     author = {P. G. Kharskii and K. N. Afanas'ev},
     title = {Spiral beams analysis based on astigmatic transform},
     journal = {U\v{c}\"enye zapiski Kazanskogo universiteta. Seri\^a Fiziko-matemati\v{c}eskie nauki},
     pages = {110--114},
     publisher = {mathdoc},
     volume = {149},
     number = {1},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZKU_2007_149_1_a16/}
}