What Are the Best Quorum Rules? A Laboratory Investigation
Luís Francisco Aguiar-Conraria, Pedro C. Magalhães, Christoph A. Vanberg
Public Choice, vol. 185, 2020, p. 215-231.

Experimental Evidence That Quorum Rules Discourage Turnout and Promote Election Boycotts
Luís Francisco Aguiar-Conraria, Pedro C. Magalhães, Christoph A. Vanberg
Experimental Economics, vol. 19, 2016, p. 886-909.