Lachand-Robert T. minimum of quadratic functionals of the gradient on the set of convex functions / T.Lachand-Robert,M.A.Peletier, 2000. - 7 p. - Текст : непосредственный.
Lachand-Robert T. Newton's problems of the body of minimal resistance in the class of convex developable functions / T.Lachand-Robert,M.A.Peletier, 2000. - 19 p. - Текст : непосредственный.
Lachand-Robert T. An example of non-convex minimization and an application to Newton's problem of the body of least resistance / T.Lachand-Robert,M.A.Peletier, 1999. - 23 p. - Текст : непосредственный.