Wind, Olaf; Christensen, Søren Brøgger; Mølgaard, Per (1998). "Colouring agents in yellow and white flowered papaver radicatum in Northern Greenland". Biochemical Systematics and Ecology. 26 (7): 771–779. Bibcode:1998BioSE..26..771W. doi:10.1016/s0305-1978(98)00031-3.
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.
Wind, Olaf; Christensen, Søren Brøgger; Mølgaard, Per (1998). "Colouring agents in yellow and white flowered papaver radicatum in Northern Greenland". Biochemical Systematics and Ecology. 26 (7): 771–779. Bibcode:1998BioSE..26..771W. doi:10.1016/s0305-1978(98)00031-3.
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.