Things They Should Invent Words For

We need a word for when you're absolutely sure you have some factoid on good authority and you know for certain that somewhere out there is a reputable citable reference to back up this statement, but you can't quite remember where you got it from. For those "Yeah, someone once did a study and I read about it in the newspaper" sort of situations.

This differs from conventional wisdom and urban legends in that you know you did in fact get this from a specific reliable source and once upon a time you could have cited the source (and once upon a time you had the source in your hand or on your computer screen), it's just that some time has passed and you've forgotten.