@article{MZM_1970_7_2_a6,
     author = {B. V. Martynov},
     title = {Degenerate fibers of three-dimensional manifolds fibered into rational surfaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {191--202},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_2_a6/}
}