@article{article,
title = {The influence of nitrogen concentration and ammonium/nitrate ratio on nitrogen-uptake, mineral composition and yield of citrus},
author = {},
year = {1992},
journal = {Plant and Soil},
volume = {147},
number = {1},
pages = {13-23},
howpublished = "\url{https://eurekamag.com/research/010/007/010007184.php}"
}