Artificial Intelligence A Modern Approach (3rd Edition): page 93.
The most widely known form of best-first search is called A* search (pronounced "A-star Search"). It evaluates nodes by combining g(n), the cost to reach the node, and h(n), the cost to get from the node to the goal:
f(n) = g(n) + h(n).
@author Ciaran O'Reilly
@author Mike Stampone