@article {39,
	title = {The influence of ammonia on the growth and photosynthesis of Ruppia drepanensis Tineo from Do{\~n}ana National Park (SW Spain)},
	journal = {Hydrobiologia},
	volume = {275/276},
	year = {1994},
	month = {219-231},
	doi = {10.1007/BF00026713},
	author = {Santamar{\'\i}a, L. and Dias, C. and Hootsmans, M.J.M.}
}
