The fastest algorithm for intersection of two sorted lists? Say that there are two sorted lists: A and B.

The number of entries in A and B can vary. (They can be very small/huge. They can be similar to each other/significantly different).

What is the known to be the fastest algorithm for this functionality?

Can any one give me an idea or reference?
Hwang and Lin's Algorithm (A simple algorithm for merging two disjoint linearly-ordered sets (1972) by F. K. Hwang , S. Lin) is the reference on how to merge (or intersect) ordered lists of unequal sizes with (possibly) fewer comparisons.  It works by calculating a stride from the ratio m/n and doing the comparison against that element in the larger list; for instance if m/n = 4 it will compare the fourth element of the larger list against the first of the other, and either eliminate all 4 elements or do a binary search within them for the correct insertion/intersection point.  

It neatly covers the continuum from merging equal-sized lists with the usual algorithm to merging a list of one element into a list of n with a single binary search.