1. 1. Proceeding of SAE International Total Life Cycle Conference & Exposition in Michigan, USA, 2000
   2. SAE paper no. 2000-01-1477 by Dr. Porag Kalita, M R S Higher Secondary School, Titabor, Assam, India.
   3. Seminar On Board Diagnostics – II, by Prof. S. Ganeshan, Oakland University, USA/2000.
   4. SAE paper No. 2000-01-1417 by Sivanadi Rajadurai and M. Tagomori, USA
   5. SAE paper No. 2000-01-1476, by Dr. Randolph E, Massachusetts Institute of Technology, USA.
   6. P. Kalita (2005), paper presented at UGC sponsored National Seminar, Chemistry Department, Guwahati University, India, 28th t0 29th January.
   7.  P. Kalita (2011), paper presented at UGC sponsored National Seminar, Chemistry Department, Dibrugarh University, India, 10th to 12th, January/11.
   8.  P. kalita,(2015), paper presented at National Conference by Kongunadu College of Engineering & Technology, Trichy, 25th march/2015, Paper I/D 20150403165.
   9.  P. Kalita (2006), paper presented at the UGC and ICSSR sponsored National Seminar, R M College, Silchar, Assam, India, Feb 6th to 7th/2006.
   10.  P. Kalita ( 2006) paper presented at N.L College, Assam, India, at Ministry of Environment & Forests , N. Delhi Sponsored Nat’l Seminar , January 28th to 29/2006.