Manna, Ester2017-08-312017-08-312017https://hdl.handle.net/2445/1148481 p.application/pdfengcc by-nc-nd (c) Manna, Ester, 2017http://creativecommons.org/licenses/by-nc-nd/3.0/es/ContractesProblemes i exercicisinfo:eu-repo/semantics/otherinfo:eu-repo/semantics/openAccess