Poort, E. van der

order aisle warehouse algorithm number travel time routesubgraph route orderpicking travel table class situation s-shape heuristic transition depot equivalence batch equivalence classes location saving result problem distance seed algorithms length strategy degree orderpicker koster seed order orderpicking route performance example s-shape heuristic erence vertice system erent clarke truck cient wright cluster component section capacity aisle j seed rule orderpicking trucks subgraph seed selection rule theorem figure batching orderpicking routes research orderpicking systems order-additio n rules orderbatching combination pallet van der poort ® rst di erences picker paper selection method ethod graph ratli vto v 0 equivalence class process warehouse 1 v-partial routesubgraph rosenthal calculation