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</ref>
<ref name="study">{{cite book |last=Stampi |first=Claudio |date=2014 |title=Why We Nap |publisher= Birkhauser |isbn=0-8176-3462-2 |chapter=What Is the Limit for Prolonged Sleep Reduction? An Objective Evaluation of the Leonardo da Vinci Ultrashort Sleep Strategy }}</ref>
}}
<ref name="study">{{cite book |last=Stampi |first=Claudio |date=2014 |title=Why We Nap |publisher= Birkhauser |isbn=0-8176-3462-2 |chapter=What Is the Limit for Prolonged Sleep Reduction? An Objective Evaluation of the Leonardo da Vinci Ultrashort Sleep Strategy }}</ref>
}}
