Helmut Maurer, Jochem Zowe. First and second-order necessary and sufficient optimality conditions for infinite-dimensional programming problems. Math. Program., 16(1):98-110, 1979. [doi]
@article{MaurerZ79,
title = {First and second-order necessary and sufficient optimality conditions for infinite-dimensional programming problems},
author = {Helmut Maurer and Jochem Zowe},
year = {1979},
doi = {10.1007/BF01582096},
url = {http://dx.doi.org/10.1007/BF01582096},
researchr = {https://researchr.org/publication/MaurerZ79},
cites = {0},
citedby = {0},
journal = {Math. Program.},
volume = {16},
number = {1},
pages = {98-110},
}