Leveling the subfloor

Need to level the subfloor before laying (gluing down) bamboo flooring. Some Web sites suggest using asphalt shingles in the low spots, but they seem to assume that one is going to nail the flooring and that the nails will will hold the shingles in place.
But what about when gluing the flooring down? Is it OK to use shingles and glue -- or nail them -- them to the subfloor?
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