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Gill, M.; Steglich, W. (1987). ”Pigments of Fungi (Macromycetes)”. Fortschr. Chem. Org. Naturst. [Prog. Chem. Org. Nat. Prod.]. Fortschritte der Chemie organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products 51: sid. 1–297. doi:10.1007/978-3-7091-6971-1_1. ISBN 978-3-7091-7456-2. PMID 3315906.
Ahmed, Zafar; Langer, Peter (2004). ”Suzuki cross-coupling reactions of γ-alkylidenebutenolides: application to the synthesis of vulpinic acid”. Journal of Organic Chemistry 69 (11): sid. 3753–3757. doi:10.1021/jo049780a. PMID 15153005.