  Cyclotomic polynomials play an important role in several areas of mathematics
and their study has a very long history, which goes back at least to Gauss
(1801). In particular, the properties of their coefficients have been
intensively studied by several authors, and in the last 10 years there has been
a burst of activity in this field of research.
  This concise survey attempts to collect the main results regarding the
coefficients of the cyclotomic polynomials and to provide all the relevant
references to their proofs. Previous surveys on this topic were given by
Lenstra (1979), Vaughan (1989), and Thangadurai (2000).
