@article{10_4064_sm222_2_2,
     author = {Earl Berkson},
     title = {Marcinkiewicz multipliers of higher variation
 and summability of operator-valued {Fourier} series},
     journal = {Studia Mathematica},
     pages = {123--155},
     year = {2014},
     volume = {222},
     number = {2},
     doi = {10.4064/sm222-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm222-2-2/}
}