%0 Journal Article %A Sharma, Bhu Dev %A Garg, Asha %T Characterization and lower bounds for additive charges for heterogeneous questionnaires %J RAIRO. Informatique théorique %D 1979 %P 383-393 %V 13 %N 4 %I EDP-Sciences %U http://archive.numdam.org/item/ITA_1979__13_4_383_0/ %G en %F ITA_1979__13_4_383_0