@article{NUMA_1983__42_132863,
     author = {Jozsef, Sloboda, Fridrich Abaffy},
     title = {Imperfect {Conjugate} {Gradient} {Algorithms} for {Extended} {Quadratic} {Functions.}},
     journal = {Numerische Mathematik},
     pages = {97--106},
     publisher = {mathdoc},
     volume = {42},
     year = {1983},
     zbl = {0524.65045},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1983__42_132863/}
}