Source: https://www.researchgate.net/profile/Jose-Valdez-8/publication/368802770_D41_Revised_list_and_specifications_of_EBVs_and_EESVs_for_a_European_wide_biodiversity_observation_network/links/6401e4ca0d98a97717d5d881/D41-Revised-list-and-specifications-of-EBVs-and-EESVs-for-a-European-wide-biodiversity-observation-network.pdf