Template:Christensen, 1987

• Christensen, K.I. 1987. Taxonomic revision of the Pinus mugo complex and P. × rhaetica (P. mugo × sylvestris) (Pinaceae). Nordic Journal of Botany 7(4): 383–408. DOI: 10.1111/j.1756-1051.1987.tb00958.x PDF  
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