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

@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}}
} 

@Misc{fishbase,
 howpublished = {\url{https://www.fishbase.se/summary/Gymnura-altavela}}
} 

@article{ParsMais2008,
 doi = {10.1007/s10641-017-0687-x},
 author = {K. T. Parsons and J. Maisano and J. Gregg and C. F. Cotton and R. J. Latour},
 title = {Age and growth assessment of western {N}orth {A}tlantic spiny butterfly ray \emph{Gymnura altavela} ({L}. 1758) using computed tomography of vertebral centra},
 year = {2008},
 journal = {Environ Biol Fish},
 volume = {74},
 pages = {736-742}
} 

@article{AlkuAli2014,
 doi = {10.3750/AIP2014.44.3.07},
 author = {Hasan Alkusairy and Malek Ali and  Adib Saad and Christian Reynaud and Christian Capap\'{e}},
 title = {MATURITY, REPRODUCTIVE CYCLE, AND FECUNDITY OF SPINY BUTTERFLY RAY, \emph{Gymnura altavela} ({E}LASMOBRANCHII: {R}AJIFORMES: {G}YMNURIDAE), FROM THE COAST OF {S}YRIA ({E}ASTERN {M}EDITERRANEAN)},
 year = {2014},
 journal = {Acta Ichthyologica et Piscatoria},
 volume = {44(3)},
 pages = {229-240}
}