Genetic Heritability and Shared Environmental Factors Among Twin Pairs With Autism
http://archpsyc.jamanetwork.com/article.aspx?articleid=1107328
How environmental and genetic factors combine to cause autism: A redox/methylation hypothesis
http://www.sciencedirect.com/science/article/pii/S0161813X0700215X
Theoretical aspects of autism: Causes—A review
http://informahealthcare.com/doi/abs/10.3109/1547691X.2010.545086