@article{CC_2007_36_3_a2,
     author = {Dolecki, Szymon and Greco, Gabriele H.},
     title = {Towards historical roots of necessary conditions of optimality: {Regula} of {Peano}},
     journal = {Control and Cybernetics},
     pages = {491--518},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {2007},
     zbl = {1166.49020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2007_36_3_a2/}
}