Reference

V.K. Bobrova, Alexey V. Troitsky, A.G. Ponomarev, A.S. Antonov (1987): Low-molecular-weight rRNAs sequences and plant phylogeny reconstruction: Nucleotide sequences of chloroplast 4.5 S rRNAs from Acorus calamus (Araceae) and Ligularia calthifolia (Asteraceae) – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 156: 13 - 27.