From the reviews:

„The book is devoted to an extensive study of formal-geometric properties of higher-order nondegenerate one-dimensional variational integrals. … The author’s approach is useful for the construction of geometric models … . The book is precisely written, very clear, in principle self-contained and can be understood by non-specialists.“ (Jan Chrastina, Zentralblatt MATH, Vol. 1044 (19), 2004)