004 05c9905c2505c3505c8005c8205c8590b15 abstract algebra butinthissection combinatorics computerscience dataprocessing extremalproblems fields graphalgorithms graphsandabstractalgebra(groups graphtheory mathematicalprogramming methodology methodologyofthesocialsciences networkmodels noneoftheabove operationsresearch operationsresearchandmanagementscience randomgraphs rings smallworldgraphs socialsciences stochastic