Schröder, C., Tautz, D., Seifert, E., & Jäckle, H. (1988). Differential regulation of the two transcripts from the Drosophila gap segmentation gene hunchback. The EMBO Journal, 7(9), 2881-2887. doi:10.1002/j.1460-2075.1988.tb03145.x.