@article{AFM_2010_35_1_a17,
     author = {Eric Schippers},
     title = {The derivative of the {Nehari} functional},
     journal = {Annales Fennici Mathematici},
     pages = {291--307},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {2010},
     doi = {10.5186/aasfm.2010.3518},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.2010.3518/}
}