Google Scholar November 24, 2025 by jlamprecht http://scholar.google.com/scholar_lookup?&title=Turnover-pulses%2C%20the%20Red%20Queen%2C%20and%20related%20topics&journal=Am.%20J.%20Sci.&volume=293&pages=418-452&publication_year=1993&author=Vrba%2CES
