This is not an exhaustive list but I will continue to add to it.

Emotion and Physiology

• Neuro-Tools: Emotion Detection January 16, 2017 https://acuityets.wordpress.com/2017/01/16/neuro-tools-emotion-detection/ accessed 3/28/17
• Broek E, Schut MH, Westerink J, Tuinenbrejier K. Unobtrusive Sensing of Emotion (USE). Journal Of Ambient Intelligence and Smart Environments (2009) 287-299.
• Kreiberg S, Autonomic nervous system in emotion: A Review. Biological Psychology 84(2010) 394-421
• Levenson RW, The Autonomic Nervous System and Emotion. Emotion Review, vol , no. (April 2014) 100-112.

Heart Rate Detection (ECG and Photoplysmography)

• Texas Instruments Application Report SLAA655-March 2015
• How to Design Peripheral Oxygen Saturation (SpO2) and Optical Heart Rate Monitoring (OHRM) Using the AFE4403
• Arduino Measures Heart Beat Rate From Fingertip http://embedded-lab.com/blog/arduino-heart-rate-meter-seven-segment-led-display/
• http://makezine.com/projects/ir-pulse-sensor/

GSR/EDA

• A Wearable Sensor for Unobtrusive, Long-Term Assessment of Electrodermal Activity. IEEE Transactions on Biomedical Engineering. Vol. 57 No.5 May 2010.
• https://hackaday.io/projects/6701/logs LMV324 for GSR/EDA
• https://www.etc.cmu.edu/projects/biofeedback/research/gsr.doc
• ttp://www.trans4mind.com/psychotechnics/gsr.html
• https://www.media.mit.edu/galvacticator/faq.html

Heart Rate Variability

• Goss CF & Miller FB. Dynamic metrics of heart rate variability. August 29, 2013, 4 pages. ArXiv:1308.6018.
• Lee C, Yoo SK, Park Y, Kim N, Jeong L, Lee B. Using Neural Network to Recognize Human Emotions from Heart Rate Variability and Skin Resistance. Proceedings of the 2005 IEEE, Engineering in Medicine and Biology 27^th Annual Conference, Shanghai China, Sept. 1-4,2005. p5523-5525
• Bailon R, Laouini G, Groa C, Orini M, Laguna P, Meste O. The Integral Pulse Frequency Modulation Model with Time Varying Threshold: Application to Heart Rate Variability Analysis During Exercise Stress Testing. IEEE Transactions on Biomedical Engineering, Vol 58, No 3 March 2011. p642-652
• Linares L, Medez AJ, Lado MJ, Oliviera DN, Vila XA, Conde I. An open source tool for heart rate variability spectral analysis. Computer Methods and Programs in Biomedicine 103 (2011) 39-50
• Zhao M, Adib F, Katabi D. Emotion Recognition using Wireless Signals. MobiCom'16, Oct 3-7, 2016 http://dx.doi/10.1145/29373750.2973762
• Valderas MT, Bolea J, Laguna P, Vallverdu M, Bailon R. Human emotion recognition using heart rate variability analysis with spectral bands based on respiration.
• Lane RD, McRae K, Reiman EM, Chen K, Athern GL, Thayer JF. Neural correlates of heart rate variability during emotion. NeroImage 44 (2009) 213-222
• Orini M, Bailon R, Enk R, Koelsch S, Mainardi L, Laguna P. A method for continuously assessing the autonomic response to music-induced emotions through HRV analysis. Med Biol Eng Comput (2010) 48-423-433
• Williams DP, Cash C, Rankin C, Bernardi A, Koenig J, Thayer JF. Resting heart rate variability predicts self-reported difficulties in emotion regulation: a focus on different facets of emotion regulation. Frontiers in Psychology, March 2015, vol 6, article 261
• Valenza G, Citi L, Lanata A, Scilingo EP, Barbieri R. Revealing Real-Time Emotional Responses: a Personalized Assessment based on Heartbeat Dynamics. Scientific Reports, 4:4998, DOI: 10.1038/srep04998