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@incollection{hammen1976respiratory,
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@misc{gruber1977the2,
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@book{ali1984photoreception1,
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@article{bernard1984invertebrate,
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@book{crossref1984photoreception,
    title = "Photoreception and Vision in Invertebrates",
    year = "1984",
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@article{crossref1985photoreception,
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@article{cronin1986photoreception,
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    title = "Photoreception in Marine Invertebrates",
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@article{crossref1986photoreception,
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    pages = "1029",
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@article{shapley1986not,
    author = "Shapley, Robert",
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    volume = "36"
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@article{wolken1988photobehavior,
    author = "Wolken, Jerome J.",
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    year = "1988",
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    doi = "10.1016/0742-8413(88)90180-6",
    number = "1",
    pages = "145-149",
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@incollection{wagner2011vision,
    author = "Wagner, H.-J.",
    title = "VISION | Extraretinal Photoreception",
    year = "2011",
    booktitle = "Encyclopedia of Fish Physiology",
    url = "https://doi.org/10.1016/b978-0-12-374553-8.00096-4",
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    pages = "159-165"
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@incollection{crossref2015photoreception,
    title = "Photoreception in hagfishes: Insights into the evolution of vision",
    year = "2015",
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    doi = "10.1201/b18935-9",
    pages = "146-165"
}