Background
Örnen - i vindarnas våld
This paper gives historical and technical background in concentrated form.
Swedish only.
Hydrogene balloon with sail and drag rope
Here the theoretical background for the balloon and the simulation is shown.
Andrée-museum
History and findings.
S.A. ANDRÉE
The Beginning of Polar Aviation, 1895-1897.
Günther Sollinger
ISBN 5-900078-42-7
An outstanding source of technical as well as historic information on the subject. Highly recommended.