Dead spot in the pedal stroke

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Hey all,
I'm looking for information on where that dreaded "dead spot" typically occurs in a pedal stroke. I know everyone can have different opinions on this, so I'm looking specifically for any scientific evidence. This is going to be part of my thesis, so scientific articles would be great.
Thanks in advance!
Ryan :)

Perhaps try contacting the makers of "Rotor Cranks" (which are designed to overcome the dead spot that occurs when the cranks are at the 12 & 6 o'clock positions).