O'Donnell K, Rooney AP, Mills GL, Kuo M, Weber NS, Rehner SA. Phylogeny and historical biogeography of true morels (Morchella) reveals an early Cretaceous origin and high continental endemism and provincialism in the Holarctic. Fungal Genetics and Biology. 2011-03, 48 (3): 252–265. PMID 20888422. doi:10.1016/j.fgb.2010.09.006.
O'Donnell K, Rooney AP, Mills GL, Kuo M, Weber NS, Rehner SA. Phylogeny and historical biogeography of true morels (Morchella) reveals an early Cretaceous origin and high continental endemism and provincialism in the Holarctic. Fungal Genetics and Biology. 2011-03, 48 (3): 252–265. PMID 20888422. doi:10.1016/j.fgb.2010.09.006.