@article{10_4064_sm152_2_3,
     author = {Jizhou Zhang},
     title = {Regularized cosine existence
  and uniqueness families for
  second order abstract {Cauchy} problems},
     journal = {Studia Mathematica},
     pages = {131--145},
     publisher = {mathdoc},
     volume = {152},
     number = {2},
     year = {2002},
     doi = {10.4064/sm152-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm152-2-3/}
}