M.  Costea, Amaranthus tamariscinus Nutt. and Amaranthus palmeri S. Watson in Romania. Acta Horti Buc. 1995-1996, 1997, pp. 121 - 125.

M.  Costea, The genus Amaranthus L. section Amaranthus in Romania. Acta Horti Buc. 1995-1996, 1997, pp. 105 - 120.

M.  Costea, ?Amaranthus L. subgenus Albersia (Kunth) Gren. & Godr. in Romania?, Rev. Rom. Biol, vol. 43, pp. 95 - 112, 1998.

M.  Costea and Tardif, F. J., ?Conspectus and notes on the genus Amaranthus in Canada?, Rhodora, vol. 105, pp. 260 - 281, 2003.

M.  Costea, Sanders, A., and Waines, G., ?Notes on some little known Amaranthus taxa (Amaranthaceae) in the United States?, Sida, vol. 19, no. 4, pp. 975 - 992, 2001.

M.  Costea, Sanders, A., and Waines, G., ?Preliminary results towards a revision of the Amaranthus hybridus species complex (Amaranthaceae)?, Sida, vol. 19, no. 4, pp. 931 - 974, 2001.

M.  Costea and Tardif, F. J., ?Taxonomy of the most common weedy European Echinochloa species (Poaceae: Panicoideae) with special emphasis on characters of the lemma and caryopsis?, Sida, vol. 20, pp. 525 - 548, 2002.