Ambrosio, L. Gradient flows [Electronic resource] : in metric spaces and in the space of probability measures / L. Ambrosio, N. Gigli, G. Savare. - Electronic text data. - Basel : Birkhauser Verl., 2005. - (Lectures in mathematics eth zгјrich). - ISBN 978-3-7643-2428-5 : Б. ц.