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jstor.org
George Poinar, Jr. Fossil onychophorans from Dominican and Baltic amber: Tertiapatus dominicanus n.g., n.sp. (Tertiapatidae n.fam.) and Succinipatopsis balticus n.g., n.sp. (Succinipatopsidae n.fam.) with a proposed classification of the subphylum Onychophora. Invertebrate Biology. 2000, 119 (1): 104–109. JSTOR 3227105. doi:10.1111/j.1744-7410.2000.tb00178.x.
Haug, J. T.; Mayer, G.; Haug, C.; Briggs, D. E. G. A Carboniferous Non-Onychophoran Lobopodian Reveals Long-Term Survival of a Cambrian Morphotype. Current Biology. 2012, 22 (18): 1673–1675. PMID 22885062. doi:10.1016/j.cub.2012.06.066.