Perhaps you should try some spelling variations:
"hedonic model" » "hedonico model", "hedonic modelo"
"hedonica model" » "hedonicoa model", "hedonica modelo", "hedonico model", "veronica model", "helenica model"
"hedonista model" » "hedonista modelo", "peronista model", "hedonismo model"
"helenista model" » "helenista modelo", "helenistica model", "helenismo model", "elenita model"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hedonic model\") OR (((\"hedonica model\") OR (((\"hedonista model\") OR (\"helenista model\"))))))~".
• Removing quotes may allow a broader search: (( hedonic model ) OR ((( hedonica model ) OR ((( hedonista model ) OR ( helenista model ))))))~.
• Adding a wildcard symbol may retrieve word variants: (("hedonic model") OR ((("hedonica model") OR ((("hedonista model") OR ("helenista model"))))))*.