2 literature references for Pisum formosum (Steven)Alef.:

Author: Allkin,R. et al.
Year: 1986
Title:
Source: Vicieae Database Project,Southampton Univ.Names..inVicieae
Author: Czerepanov,S.K.
Year: 1981
Title:
Source: Plantae Vasculares, URSS. Leningrad.