@Article{ PORRAS_FELDMANN_KING:455-463,

author = { JOSÉ IGNACIO PORRAS SÁNCHEZ and D. MATTHEW FELDMANN and FREDERICK W. KING } ,

title = { A NONLINEAR PROGRAMMING APPROACH TO LOWER BOUNDS FOR THE GROUND-STATE ENERGY OF HELIUM },

journal = { INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY },

year = { 1999 },

volume = { 71 },

issn = { 0020-7608 },

pages = { 455-463 },

}