00285nam a2200121Ia 4500082002000000100001300020245004000033260002500073300001600098490003900114500000500153700000500158  a530.3bAr714.MM  aAris, R.  aMathematical modelling techniquesb  aLondonbPitmanc1978  a191p. Index  aResearch notes in Mathematicsv 24  a  a