Until recently most heuristics for combinatorial optimization problems could be grouped into
a few classes. However, since the late 1980s a variety of new approaches for such problems …

Nonlinear integer programming problems with bounded feasible sets are considered. It is
shown how the number of constraints in such problems can be reduced with the aid of an …

A tractor-trailer problem, with full load, from the class of combined routeing and scheduling
problems is described. Distinctive features of the problem are: movements must be carried …

PLUS computer program (S-PLUS 6.2, Insightful Corporation, Seattle, Wash.) to simulate
survival among thousands of patients arriving for coronary surgery over a 3-year period, …

A minimum cost network flow model is proposed to deal with the problem of bus trip
scheduling in heavily congested cities. Real instances of scheduling problems in Bangkok are …

A new relaxation is presented for the general mixed integer programing problem. It is proved
that this relaxation is always at least as good, end in one demonstrated case better, than …

Social media data are increasingly utilised as a low-cost alternative to visitor surveys in
characterising nature-based recreation. However, the information available on individual users is …

… • last but indubitably not least, to Marius Sinclair and Suzette Winckler, the spice of our
respective lives - for their generosity and understanding in allowing us all the extra time this …

Representing the economic value of recreation generated by natural ecosystems can
provide a powerful incentive for their conservation. Demonstrating value, however, requires …

… Sinclair …