The general theory of such equilibria will be studied later under the head of the phase rule.
When the equilibria become more complex difficulties of interpretation of the experimental results often arise.
aggregative approach and the elucidation of properties of their equilibria remain to be carried out.
bifurcation of relative equilibria.
Eldredge, N. and Gould, S.J. (1972) Punctuated equilibria: An alternative to phyletic gradualism.