Link: Nelson, Thailand’s election system Partyforumseasia:  Recommended reading:

The Attempt to Adopt a Mixed-Member Proportional Election System in Thailand: The Near Miss of the Constitution Drafting Committee and Constitution Drafting Assembly in 2007, by Michael H. Nelson

Available at: Academia.edu
and Contemporary Southeast Asian Dynamics, Working Paper Series No. 11, ISSN 2191-169X, Lehrstuhl für Südostasienkunde, University of Passau, Germany