I am looking for the articles in which Lotka and Volterra published their original predator prey model. I couldn’t find the model presented in many textbooks in Lotka’s book Elements of Physical Biology or Volterra’s paper Fluctuations in the Abundance of a Species considered Mathematically.
Is there really Lotka–Volterra model for dynamics of two competing species? On Wikipedia and Murray’s book Mathematical Biology: an Introduction, it is written that it exists but I couldn’t find it in their papers.