@article{DAN_1980_253_2_a20,
     author = {K. Sh. Karaev and N. G. Furmanova and N. V. Belov},
     title = {On the crystal- and molecular structure of photochromic spiropyran, $\mathrm{C}_{23}\mathrm{H}_{19}\mathrm{NO}_3$},
     journal = {Doklady Akademii Nauk},
     pages = {338--341},
     publisher = {mathdoc},
     volume = {253},
     number = {2},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_253_2_a20/}
}