@article{AA_2016_28_2_a6,
     author = {S. Yu. Orevkov and E. I. Shustin},
     title = {Real algebraic and pseudoholomorphic curves on the quadratic cone and smoothings of singularity~$X_{21}$},
     journal = {Algebra i analiz},
     pages = {138--186},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/AA_2016_28_2_a6/}
}