Reference

J.G. Chmielewski, C. C. Chinnappa, J.C. Semple (1990): Patterns of intraspecific Variation in Antennaria alborosea, A. corymbosa, A. marginata, A. microphylla, A. parvifolia, and A. umbrinella (Asteraceae: Inuleae) – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 169: 123 - 150.