Though this paper is one of the most influential in the field.
Later derived parsers, such as the LALR parser, have been and continue to be standard practice, such as in Yacc and descendents.
Description: From the abstract: "The global data relationships in a program can be exposed and codified by the static analysis methods described in this paper.
Research in this area is remarkable because (1) the algorithms and proofs tend to be very simple and beautiful, and (2) the model makes no statistical assumptions about the data.
In other words, the data need not be random (as in nearly all other learning models), but can be chosen arbitrarily by "nature" or even an adversary.