TY  - JOUR
AU  - Abel, Volker
TI  - Conditions for lumping the grades of a hierarchical manpower system
JO  - RAIRO - Operations Research - Recherche Opérationnelle
PY  - 1983
SP  - 379
EP  - 383
VL  - 17
IS  - 4
PB  - EDP-Sciences
UR  - http://www.numdam.org/item/RO_1983__17_4_379_0/
LA  - en
ID  - RO_1983__17_4_379_0
ER  -