Aptroot, A. (2016). "The first European Willeya (Verrucariaceae) on limestone brought from China". Herzogia. 29 (2): 688–691. doi:10.13158/heia.29.2.2016.688. S2CID90816721.
Aptroot, A. (2016). "The first European Willeya (Verrucariaceae) on limestone brought from China". Herzogia. 29 (2): 688–691. doi:10.13158/heia.29.2.2016.688. S2CID90816721.