Harrison, D., Geyer, P., Spana, C., & Corces, V. The gypsy retrotransposon of Drosophila melanogaster: mechanisms of mutagenesis and interaction with the suppressor of Hairy-wing locus. Developmental Genetics, 10(3), 239-48. https://doi.org/10.1002/dvg.1020100313 (Original work published 1989)