@Misc{ 
  CaDeMaYu15a,
  author = { Cappelletti-Montano, Beniamino and De Nicola, Antonio and Marrero, Juan Carlos and Yudin, Ivan },
  title = { Hard Lefschetz theorem for Vaisman manifolds },
  journal = { arXiv:1510.04946 [math.DG] },
  year = { 2015 },
  pages = {  },
  URL = { https://gecogedi.dimai.unifi.it/paper/229/ },
  note = { cvgmt preprint}
}