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

@Book{Gunt1990,
 author = {G\"{u}nther, R.},
 year = {1990},
 title  = {Die Wasserfr\"{o}sche Europas},
 publisher = {A. Ziemsen Verlag},
 sereis = {Die Neue Brehm Buecherei}}
} 

@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{SochOgie2010,
 author = {M. Socha and M. Ogielska},
 year = {2010},
 title = {Age structure, size and growth rate of water frogs from central {E}uropean natural \emph{Pelophylax ridibundus}-\emph{Pelophylax esculentus} mixed populations estimated by skeletochronology},
 journal = {Amphibia-Reptilia},
 volume = {31},
 pages = {239--250}
} 

@Article{Ivan2017,
 author = {N. L. Ivanova},
 year = {2017},
 title = {Growth Characteristics and Rates of the Mash Frog \emph{Pelophylax ridibundus} {P}all. {I}ntroduced into Water Bodies of the {M}iddle {U}rals},
 journal = {Biology Bulletin},
 volume = {44},
 pages = {412-416}
} 

@Misc{amphibiaweb,
 howpublished = {\url{https://amphibiaweb.org/cgi/amphib_query?where-genus=Pelophylax&where-species=ridibundus}}
} 

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