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} 

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 publisher = {Cambridge Univ. Press, Cambridge},
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} 

@Book{Kemp1995,
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 year = {1995},
 title  = {The hornbills},
 publisher = {Oxford Univ Press}
} 

@Article{MaceAzua1997,
 author = {M. Mace and J. Azua},
 year = {1997},
 title = {Breeding and hand-rearing of the southern {S}ulawesi hornbill \emph{Penelopides exarhatus sanfordi} for the {Zoological society of San Diego}},
 journal = {Int. Zoo Yb.},
 volume = {35},
 pages = {247--253}
} 

@Article{KlopCuri2000,
 author = {E. Klop and E. Curio and L. L. Lastimoz},
 year = {2000},
 title = {Breeding biology, nest site characteristics and nest spacing of the Visayan Tarictic Hornbill \emph{Penelopides panini panini} on {Panay, Philippines}},
 journal = {Bird Conservation International},
 volume = {10},
 pages = {17--27}
} 

@Article{PrinPres1991,
 doi = {10.1016/0300-9629(91)90122-S},
 author = {R. Prinzinger and A.Pre{\ss}mar and E. Schleucher},
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 title = {Body temperature in birds},
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 volume = {99A(4)},
 pages = {499-506}
}