Nephilim deleted edit 

You state reliable sources. The first part of my edit is that which is taught in college (you would know if you ever attended). It is taught in literature class. It is: When studying this passage, or any passage of the Bible, it is best to use the Exegetical method, which is tearing it down to the bottom and rebuilding it using 6 contexts. First, one must use the Bible to interpret the Bible. Second, using the 6 contexts, which are: 1. What is the context (main idea, or thought) of the Bible?, 2. What is the context of the book you are reading (Genesis, Exodus, etc.)?, 3. What is the context of the chapter you are reading?, 4. What is the context of the verse you are reading? 5. What is the context of the key words?, and 6. What is the historical context? How did the people of that time think, act, etc. An example, to name something is to place one's authority on it. A king of a city state that has conquered another city state gives it a new name, because he is place his authority on it. Two things to keep in mind for a sound, correct interpretation of this passage are: 1. Where is the beginning of the narrative; the pivotal spot? It is Genesis 3:15, which is a prophecy of Christ and the beginning of the battle between evil and good. It is followed by the first example the story of Cain and Abel., 2. In the original Bible there were no chapter or verses, these were added later to make it easier to find passages. The story of the Flood begins at Genesis 4:17 and goes to Genesis 9:7 (this story should have been 1 chapter).
This aids the scholar attempting to understand and interpret a difficult passage. 
The next part: Wilson's Old Testament Word Studies, William Wilson (MacDonald Publishing Co. ISBN 0-917006-27-5, New Wilson's Old Testament Word Studies, William Wilson; Kregel Publications 1987, ISBN 0-8254-4030-0/ both page 185)renders the word nephilim meaning as to fall upon other in rapine violence and apostates fallen from true religion. Strong's Exhaustive Concordance Of The Bible Hebrew and Chaldee Dictionary, James Strong (MacDonald Publishing Co. ISBN 0-917006-01-1) cites the word as a bully,tyrant, or dictator. 
Here is given references to where the data is gotten (even page numbers), but by what you say this is reliable or acceptable. Just what would be.
The next part: One can get copies of the First and Second Book of Enoch, which one can read. Two such books are The Old Testament Pseudepigrapha, Vol 1(Doubleday & Co. Inc., 1983 ISBN 0-385-09630-5)and The Other Bible(Harper & Row, Publishers ISBN 0-06-250031-7)and there others. A WARNING. When reading these books keep in mind that they are non-canonical and are considered fictional; not God inspired and truthful. When one reads the Book of Enoch one sees a measurement for the offspring as 300 cubits. A cubit is 18 inches (check any Bible dictionary), or 1 1/2 feet. As such the offspring is 450 feet tall.
This again shows where one can find the data. All these references are from PUBLISHED and ESTABLISHED books, that is accepted by college professors, but not by you. How did the article get on Wikipedia? Did the author bribe someone, or is it that they are a dear buddy?
You may think this harsh, and it may be, but it is deserved. The reason why the information has been verified with published authentic sources that you refuse to accept. Then what needs to take place is that the articles references must be rejected as well for they are based on the same method and material. Why accept one person's references and not an others when both are from published established sources available to the public.
Once before I attempted this folly on an other article and again nothing, not even a police report, was accepted. The only thing I can think for this is that Wikipedia employees are not getting their palm greased, or that I am not a dear buddy with an in.
The reliable verified referenced attainable data is beneficial and helpful to the reader and scholar, but you and Wikipedia don't care, and spit on me, my effort to help, and the ones who would have benefited from it. Now you cam laugh and do a dance for you wasted my time and you have robbed the reader.