The fist one (by Vittoz et. al.) is a little bit on the theoretical
side, but the "Fox files" counterweight this with short practical
application notes.
That is good, I'd been looking for Vittoz's paper outside the walls of the IEEE. :)
Unfortunately, none of this gives us specific guidance on how to select crystals for this mode.
The biggest clue I have so far, is that such a crystal will have a low value specified for loading capacitance.
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Feel the power of the dark side! Atmel AVR
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Feel the power of the dark side! Atmel AVR