Hello Horst,
-SGLO stands for Studie Groep Lucht Oorlog or Airwar Studygroup, a Dutch airwar research group. The database is:
https://verliesregister.studiegroepluchtoorlog.nl/
-NCA stands for Nachtjagd Combat Archive, my current book project with Wingleader:
https://www.wingleader.co.uk/series/...combat-archive
Beste Grüsse, Theo