The following recommendations of websites are reliable sources from individuals who have been involved with this issue for many years. Be discerning about internet sources as there are some questionable ones. Let the buyer beware.
For more information about aspartame, try Dr. Woodrow Monte's Website The Truth About Stuff. The site has extensive documentation, including lots of full text articles.
Dr. Hull's Website Sweet Poison has information on aspartame, while her website Splenda Exposed has information about her book on sucralose as well as articles on that topic.
Though Mary Nash Stoddard doesn't appear in this story, she has appeared in many CBN News stories on aspartame since 1989. Her Website is the Aspartame Consumer Safety Network. She has had a particular concern about air safety and the unknowing pilots who have had brain fog or seizures from aspartame.