Here's a position statement on early childhood from NAGC:

http://www.nagc.org/sites/default/f...y%20Childhood%20Position%20Statement.pdf

A paper cited in the above statement, on reading achievement in precocious readers from age 5 to 11:

http://centaur.reading.ac.uk/31745/

And a case study by the same authors:

http://centaur.reading.ac.uk/31744/

Cut sheet on educating early readers from UConn:

http://www.gifted.uconn.edu/nrcgt/reports/Trifolds/A9403P.pdf

ERIC summary on research regarding precocious readers:

http://files.eric.ed.gov/fulltext/EJ750775.pdf

...pronounced like the long vowel and first letter of the alphabet...