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

@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{DeWi1954,
 author = {Robert M. DeWitt},
 year = {1955},
 title = {Reproduction, Embryonic Development, and Growth in the Pond Snail, \emph{Physa gyrina} {S}ay},
 journal = {Transactions of the American Microscopical Society},
 volume = {73(2)},
 pages = {124-137}
} 

@Article{DeWi1955,
 author = {Robert M. DeWitt},
 year = {1955},
 title = {The Ecology and Life History of the Pond Snail \emph{Physa gyrina}},
 journal = {Ecology},
 volume = {36(1)},
 pages = {40-44}
}