References
^ John S. Penn (2008). Retinal and Choroidal Angiogenesis, Springer. Product. ISBN 9781402067792 (revised May 2012)^ John S. Penn (2008). Retinal and Choroidal Angiogenesis, Springer. Wiki. ISBN 9781402067792 (revised May 2012)^ Penn, J. S. (2014). Retinal and Choroidal Angiogenesis, SPRINGER. BiggerBooks. ISBN 9781402067792 (revised Nov 2023)
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