@Misc{Wiki,
 howpublished = {\url{http://en.wikipedia.org/wiki/Pelophylax_perezi}}
} 

@Book{Kooy2010,
 author = {Kooijman, S.A.L.M.},
 year = {2010},
 title  = {Dynamic Energy Budget theory for metabolic organisation},
 publisher = {Cambridge Univ. Press, Cambridge},
 pages = {Table 4.2 (page 150), 8.1 (page 300)},
 howpublished = {\url{../../../bib/Kooy2010.html}}
} 

@Article{EsteGarc1996,
 doi = {10.1139/z96-216},
 author = {Esteban, M. and García-París, M. and Castanet, J.},
 year = {1996},
 title = {Use of bone histology in estimating the age of frogs (\emph{Rana perezi}) from a warm temperate climate area},
 journal = {Canadian Journal of Zoology},
 volume = {74(10)},
 pages = {1914–1921}
} 

@Misc{AnAge,
 howpublished = {\url{https://genomics.senescence.info/species/entry.php?species=Pelophylax_perezi}}
}