@article{10_4064_sm199_3_4,
     author = {Wojciech Chojnacki},
     title = {On operator-valued  cosine
  sequences on {UMD} spaces},
     journal = {Studia Mathematica},
     pages = {267--278},
     publisher = {mathdoc},
     volume = {199},
     number = {3},
     year = {2010},
     doi = {10.4064/sm199-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm199-3-4/}
}