@book {8484,
	title = {Manual of the grasses of the United States, ed. 2 (rev. A. Chase). U.S.D.A. Miscellaneous Publication n{\textdegree} 200},
	year = {1951},
	month = {1951///},
	pages = {1051 - 1051},
	publisher = {Washington D.C},
	organization = {Washington D.C},
	author = {A.S. Hitchcock}
}
@book {8607,
	title = {Flora Neerlandica, deel 1, aflevering 2. KNBV},
	year = {1951},
	month = {1951///},
	publisher = {Amsterdam},
	organization = {Amsterdam},
	author = {P. Jansen}
}
@article {8007,
	title = {Note sur quelques phan{\'e}rogames adventices},
	journal = {Lejeunia},
	volume = {15},
	year = {1951},
	month = {1951///},
	pages = {59 - 62},
	author = {J. Druet and J. Duvigneaud}
}
@article {8011,
	title = {Classification des Apocynac{\'e}es},
	journal = {Les esp{\`e}ces du genre Vinca. Bull. Mus. Nat. Hist. Natl., ser. 2, 23},
	volume = {22},
	year = {1951},
	month = {1951///},
	pages = {439 - 444},
	author = {M. Pichon}
}
