Ebbinghaus              Union Growth and Decline in Western Europe
                        1950-95
Osa                     Political Opportunity in Non-democracies
QCA-package             Qualitative Comparative Analysis
Rokkan                  Divided Working-Class Movements
Stokke                  Causal mechanisms and regime effectiveness
Yamasaki                The problem of contradictory simplifying
                        assumptions
all.expr                Create a matrix with all possible combinations
                        of conditions
create.chart            Create the prime implicants chart
create.string           Create a vector of strings containing
                        combinations of presence/absence of conditions
pretty.string           Separate a very long vector of strings on
                        several rows
pretty.table            Print a nicely formatted matrix or truth table
qmcc                    Find a minimum solution in a boolean procedure,
                        using the Quine-McCluskey algorithm
truth.table             Create a truth table for crisp sets
