Guillaumie S, Charmet G, Linossier L, Torney V, Robert N, Ravel C. Colocation between a gene encoding the bZip factor SPA and an eQTL for a high-molecular-weight glutenin subunit in wheat (Triticum aestivum). Genome. 2004 Aug;47(4):705–13. doi: 10.1139/g04-031. PMID: 15284875.