@article{MusunthiaKoppitz2017,
  author    = {Tiwadee Musunthia and J{\"o}rg Koppitz},
  title     = {Maximal subsemigroups of some semigroups of order-preserving mappings on a countably infinite set},
  journal   = {Forum mathematicum},
  volume    = {29},
  pages     = {971 -- 984},
  doi       = {10.1515/forum-2015-0093},
  year      = {2017},
}