Philippe Flajolet
Approximate counting : an alternative approach
Peter Kirschenhofer, Helmut Prodinger
Approximate Counting
Russ Bubley
The Complexity of Approximate Counting (Preliminary Version)
Larry J. Stockmeyer
The Relative Complexity of Approximate Counting Problems
Martin Dyer, Leslie Ann Goldberg, Catherine Greenhill +1 more
Approximate counting with uniform constant depth circuits
Miklós Ajtai
QMA Lower Bounds for Approximate Counting.
William Kretschmer