@article{article,
title = {Annual classification of beech seedlings fagus sylvatica l in an even aged 18 year old and natural beech regeneration},
author = {},
year = {1992},
journal = {Annales des Sciences Forestieres},
volume = {49},
number = {2},
pages = {133-147},
howpublished = "\url{https://eurekamag.com/research/007/021/007021684.php}"
}