Methods of Differential Geometry in Classical Field Theories:   k-symplectic and k-cosymplectic approaches
  This book is devoted to review two of the most relevant approaches to the study of classical field theories of first order, say k-symplectic and k-cosymplectic. In the last part, we relate the k-symplectic and k-cosymplectic manifolds with the multisymplectic theory. 
M. de Le\'on, M. Salgado and S. Vilari\~no
math-ph math.MP