as.ref                  coercing to reference
deref                   dereferencing references
HanoiTower              application example for references
is.ref                  checking (for) references
optimal.index           creating standardized, memory optimized index
                        for subsetting
ref                     creating references
refdata                 subsettable reference to matrix or data.frame
regression.test.refdata
                        regression test for refdata
sleep.wrapper           wrapper to get some measures for all platforms
