BibTex format
@inbook{Zoppoli:2020:10.1007/978-3-030-29693-3_2,
author = {Zoppoli, R and Sanguineti, M and Gnecco, G and Parisini, T},
booktitle = {Communications and Control Engineering},
doi = {10.1007/978-3-030-29693-3_2},
pages = {39--88},
title = {From functional optimization to nonlinear programming by the extended ritz method},
url = {http://dx.doi.org/10.1007/978-3-030-29693-3_2},
year = {2020}
}