@article{SM_2002_193_5_a3,
     author = {V. F. Kirichenko and L. I. Vlasova},
     title = {Concircular geometry of nearly {K\"ahler} manifolds},
     journal = {Sbornik. Mathematics},
     pages = {685--707},
     year = {2002},
     volume = {193},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_5_a3/}
}