Most of the fundamental papers on ribbon microphones won't be found in the AES library, since the AES didn't exist until 1948 when the ribbon microphone was a mature technology. You'll have to look in the JASA and the BSTJ for them. But, even so, there has been a remarkable amount of work done since then.
Ribbon Velocity Microphones
JAES Volume 18 Issue 3 pp. 263-268; June 1970
Olson, Harry F.
Harry Olson's fundamental analysis of the physics of an open ribbon microphone. Although parts of this analysis appear in Mr. Olson's work going back to the thirties, this paper draws all of them together into one whole.
Dynamic Motion of the Corrugated Ribbon in a Ribbon Microphone
Paper 8215; AES Convention 129; November 2010
Abel, Jonathan S.; Schlessinger, Daniel Moses
In 2010, engineers from the CCRMA and the Sennheiser DSP Research Laboratory measured ribbon motion with laser vibrometers, permitting direct verification of Olson's model and extending it into additional dimensions by elucidating motions other than simple longitudinal waves.
On Electrical Loading of Microphones
JAES Volume 3 Issue 4 pp. 194-197; October 1955
Werner, Richard E.
In 1956, Richard Werner from RCA performs the first analysis on how electrical loading of the microphone affects the mechanical damping of the ribbon and how the ribbon can be controlled by the transformer design and preamplifier load.
Analysis of the Interaction between Ribbon Motor, Transformer, and Preamplifier and Its Application in Ribbon Microphone Design
Paper 8126; AES Convention 128; May 2010
Following on Werner's work, David Julian from AEA performs a more complete electrical analysis of the ribbon/transformer/preamplifier system.
The Development and Design of a Flat Diaphragm, Printed Ribbon Microphone Capsule
Paper 1934; AES Convention 72; October 1982
Fostex's "Printed ribbon" design is mechanically very different than a conventional suspended ribbon but electrically similar.