* {{cite book | last=Gresser | first=Ursula | last2=Zöllner | first2=Nepomuk | title=Urate Deposition in Man and Its Clinical Consequences | publisher=Springer | publication-place=Berlin ; New York | date=1991 | isbn=3-540-53971-9}}
<ref name="o873">{{cite book | last=Gresser | first=Ursula | last2=Zöllner | first2=Nepomuk | title=Urate Deposition in Man and Its Clinical Consequences | publisher=Springer | publication-place=Berlin ; New York | date=1991 | isbn=3-540-53971-9 | page=}}</ref>