Note on classical notion of Lee form
  This note is devoted to partial study of recurrent equation $d\omega=\beta \wedge \omega$, based on linear algebra of exterior forms. Such equation was considered by Lee, for non-degenerate 2-form. In this note we approach general case, when $\omega$ is arbitrary. Particularly, we extend results obtained by Lee, on odd-forms. 
Piotr Dacko
math.DG