[Syrphidae] Platycheirus paper

[Stefan Pruner]

Hello!

The following paper could help me with determination issues I have with
specimens in my collection.
Could anyone share a copy of
Speight, M.C.D. & Goeldlin de Tiefenau, P. (1990) Keys to distinguish
Platycheirus
angustipes, P.europaeus, P.occultus and P.ramsarensis (Dipt., Syrphidae)
from other clypeatus group species known in Europe.
?

Thank you very much in advance!

Stefan
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