Can you help identifying invertebrates from juvenile fish gut contents, River Teme, Worcestershire, UK?

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Can anyone help identify this invertebrate from a fish gut, perhaps Psocoptera?

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Who can help me to get the PDF file of this paper?

Yuen P.H. 1965. Some studies on the taxonomy and development of some Rhabdisoid and Cosmocercoid nematodes from Malayan amphibians. Zoologischer Anzeiger, 174, 275–298. Thank you very much for...

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Viktor Baranov

Three lower are frontal sheets from exuviae of Chironomidae (Tribe Chironomini) pupae

Catherine Gutmann Roberts

Thank you so much Viktor that's so helpful. That would make sense as I've had a lot of chironomid larvae in the guts too.

Viktor, do you think this could be a chironomid hatching from it's pupa?