@article{ButGao1991,
  author    = {Paul Pui-Hay But and Cai-Hua Gao},
  title     = {Epiphyllous Hepaticae of Kowloon Peninsula (Hong Kong)},
  journal   = {Tropical bryology},
  number    = {4},
  pages     = {17 -- 22},
  year      = {1991},
}