00270    a2200109   4500020001500000082001500015100001600030245002700046260004100073300002200114650002400136  a812240006X  a511.8bKAP  aKapur, J.N.  aMathematical modelling  aNew DelhibWiley Easternc1988g1994  avii, 259p.c24cm.  aMathematical models