Atkin, Owen K.; Villar, Rafael; Cummins, W. Raymond (1993). "The ability of several high arctic plant species to utilize nitrate nitrogen under field conditions". Oecologia. 96 (2): 239–245. Bibcode:1993Oecol..96..239A. doi:10.1007/bf00317737. PMID28313420.
Atkin, Owen K.; Villar, Rafael; Cummins, W. Raymond (1993). "The ability of several high arctic plant species to utilize nitrate nitrogen under field conditions". Oecologia. 96 (2): 239–245. Bibcode:1993Oecol..96..239A. doi:10.1007/bf00317737. PMID28313420.
Atkin, Owen K.; Villar, Rafael; Cummins, W. Raymond (1993). "The ability of several high arctic plant species to utilize nitrate nitrogen under field conditions". Oecologia. 96 (2): 239–245. Bibcode:1993Oecol..96..239A. doi:10.1007/bf00317737. PMID28313420.