@article{ZNSL_2005_321_a1,
     author = {O. Yu. Vanushina},
     title = {On  semicontinuity of ramification 
},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {13--35},
     publisher = {mathdoc},
     volume = {321},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2005_321_a1/}
}