@article{TVP_2005_50_1_a5,
     author = {O. E. Barndorff-Nielsen and N. Shephard},
     title = {Power variation and time change},
     journal = {Teori\^a vero\^atnostej i ee primeneni\^a},
     pages = {115--130},
     year = {2005},
     volume = {50},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TVP_2005_50_1_a5/}
}