Literature references

2 literature references for Trifolium ukrainicum Opperman:

Author: Yakovlev G, Sytin A & Roskov Y
Year: 1996
Title:
Source: Legumes of Northern Eurasia. Royal Botanic Gardens, Kew.
Author: Roskov,Yu.R.
Year: 1990
Title:
Source: Revis.of the g.Trifolium in fl.USSR.Cand.thes.Leningrad(Rus)