Аналитическая геометрия и линейная алгебра. Умнов А.Е. - 291 стр.

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                                                       α 24           ′′ ξ 3′′                      ′′ ξ 2′′ − α 24
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                                                             α 24         ′′ 2
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                                                    λ1ξ1′′′ 2 + 2( α 24
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                                                                              ′′ 2 )ξ 2′′′ + α 44
                                                                                               ′′ = 0 
                                                                                 
                                                                                 
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        Ë°ãÒ α 24
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