r yuvaraj, m murugappan, norlinah mohamed ibrahim, kenneth sundaraj, mohd iqbal omar, khairiyah mohamad, r palaniappan.  (2014).  detection of emotions in parkinson`s disease using higher order spectral features from brain`s electrical activity.  - biomedical signal processing and control.  108-116. 

r yuvaraj, m murugappan, norlinah mohamed ibrahim, mohd iqbal omar, kenneth sundaraj, khairiyah mohamad, r palaniappan and m satiyan.  (2014).  emotion classification in parkinson`s disease by higher-order spectra and power spectrum features using eeg signals: a comparative study.  - journal of integrative neuroscience.  89-120. 

r yuvaraj, m murugappan, mohd iqbal omar, norlinah mohamed ibrahim, kenneth sundaraj, khairiyah mohamad, m satiyan.  (2014).  emotion processing in parkinson`s disease: an eeg spectral power study.  - international journal of neuroscience.  491-502. 

rafiz abdul rani, rosdinom razali, rozita hod, khairiyah mohamad, shahrul azmin md rani. wan nur nafisah wan yahya, ramesh sahathevan, rabani remli, zhe kang law, norlinah mohamed ibrahim, hui jan tan.  (2014).  suicidal ideation amongst epilepsy patients in a tertiary centre.  - neurology asia.  19(2):129-136. 

rajamanickam yuvaraj, murugappan murugappan, mohamed ibrahim norlinah, kenneth sundaraj, mohamad khairiyah.  (2013).  review of emotion recognition in stroke patients.  - dementia and geriatric cognitive disorders.  36(3-4):179-196.