books.google.com - This introduction to mathematical methods that are useful for studying population phenomena is intended for advanced undergraduate and graduate students, and will be accessible to scientists who do not have a strong mathematics background. The material is graded in mathematical difficulty. The earlier...https://books.google.com/books/about/Mathematical_Methods_of_Population_Biolo.html?id=LDUuJDyHCD4C&q=oscillations&utm_source=gb-gplus-shareMathematical Methods of Population Biology