Geodesic
On the rate of convergence of the method of two-step gradient descent
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 5, pp. 1227-1229 
S. P. Voskoboinikov; Yu. B. Senichenkov; I. A. Tsukerman. On the rate of convergence of the method of two-step gradient descent. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 5, pp. 1227-1229. http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_5_a18/
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     author = {S. P. Voskoboinikov and Yu. B. Senichenkov and I. A. Tsukerman},
     title = {On the rate of convergence of the method of two-step gradient descent},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1227--1229},
     year = {1983},
     volume = {23},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_5_a18/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

Examples are given, showing that it is undesirable to use the two-step gradient descent method to solve sets of linear equations with non-Hermitian matrix.