http://www.google.com/search?hl=en&q=socrates+on+existence
Several good articles here.
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What was Socrates view on existence?
http://www.abu.nb.ca/Courses/GrPhil/Socrates.htm
http://everything2.com/index.pl?node_id=1679049
These sites should give you a good Idea on his philosophy on existence.
To understand Socrates' view on existence, you can start by reading articles and sources that discuss his philosophy. The links you provided seem to be good resources for understanding Socrates' perspective.
1. The first link (http://www.abu.nb.ca/Courses/GrPhil/Socrates.htm) is from a course website and offers information specifically about Socrates' philosophy. It should provide you with a good understanding of his view on existence.
2. The second link (http://everything2.com/index.pl?node_id=1679049) is from a website that allows users to contribute their knowledge on various topics. This particular page appears to discuss Socrates' philosophy on existence, so it might also give you insights into his views.
By going through these links and reading the articles, you should be able to gain a good understanding of Socrates' perspective on existence. Remember, it is always helpful to cross-reference information and explore multiple sources to get a well-rounded view on any philosophical topic.