Firstly to the online version of Julian Simon's "The Ultimate Resource II".
In particular to Chapter 22: Standing Room Only? The Demographic Facts
and to Chapter 24: Do Humans Breed Like Flies? Or Like Norwegian Rats?
The second link is to the publications page of José Antonio Ortega Osona. Again the most interesting him for the work I am currently doing is the PhD Thesis on Healthiness and the Economic Determinants of Mortality Fluctuations