https://oar.princeton.edu/bitstream/88435/pr1qj9r/1/BallotMarkingDeviceVoters.pdf https://oar.princeton.edu/bitstream/88435/pr1qj9r/1/BallotMa... This is proba

https://oar.princeton.edu/bitstream/88435/pr1qj9r/1/BallotMarkingDeviceVoters.pdf https://oar.princeton.edu/bitstream/88435/pr1qj9r/1/BallotMa... This is probably the main paper you are referencing?