Niels Ditlev Riegels (1755 - 1802), a Danish historian, journalist and author of critical pamphlets
Niels Bohr | Niels-Henning Ørsted Pedersen | Niels Bohr Institute | Niels Juel | Niels Ferguson | Niels Henrik Abel | Niels Shoe Meulman | Niels Helveg Petersen | Michael Riegels | Niels Frederiksen | Niels Ebbesen | Niels Ditlev Riegels | Roy Riegels | Niels Viggo Bentzon | Niels Turin Nielsen | Niels "the Terminator" Feijen | Niels Simonsen Glostrup | Niels Rosing-Schow | Niels Peter Lemche | Niels Kristian Nielsen | Niels Kristian Iversen | Niels Feijen | Niels Erik Nielsen | Niels Christian Ditleff | Niels Bjerrum | Niels Bätge | Niels Arestrup | Niels Albert | Niels | Frederick Niels Larsen |
The American historian H. Arnold Barton has characterised Birckner, alongside with Niels Ditlev Riegels, as being one of "the most original thinkers" of the radical group of authors in Denmark in this period.