@article{Walas:2018,
  author  = "Ł. Walas and W. Mandryk and P. Thomas and Ż. Tyrała-Wierucka and G. Iszkuło",
  title   = "Sexual systems in gymnosperms: A review",
  journal = "Basic and Applied Ecology",
  volume  = "Vol. 31",
  pages   = "1--9",
  year    = "2018",
}