Template:Wiegrefe, Sytsma & Guries, 1994
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- Wiegrefe, S., Sytsma, K.J. & Guries, R.P. 1994. Phylogeny of Elms (Ulmus, Ulmaceae): Molecular Evidence for a Sectional Classification. Systematic Botany 19: 590–612. DOI: 10.2307/2419779