John Stuart Mill: "Of True and False Democracy; Representation of All, and Representation of the Majority only", Chapter 7 of Considerations on Representative Democracy (1861)
Henry R Droop: On Methods of Electing Representatives (1881)
Brian L Meek: A New Approach to the Single Transferable Vote: Paper I: Equality of Treatment of voters and a feedback mechanism for vote counting (1969)
Brian L Meek: A New Approach to the Single Transferable Vote: Paper II: The problem of non-transferable votes (1970)
Voting matters: "To advance the understanding of preferential voting systems"