Who was the first to coin the terms of soft and hard selection? Soft and hard selection are sometimes used with different definitions. I have been told that at first place hard and soft selection has been defined in the following way: * soft selection: Each deme makes the same contribution to the next generation * hard selection: Different demes make different contribution to the next generation Who first described these concepts? What was the first paper?

I believe it's Wallace, B. 1968 "Polymorphism, population size,and genetic load" In R. C. Lewontin _Population Biology and Evolution_. Wallace also discusses his distinction between soft and hard selection in his 1975 paper "Hard and Soft Selection Revisited" (JSTOR link).