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dynamic condensation

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Are there any references to "dynamic condensation"? There is a well-known
method, static condensation, that condens a stiffness matrix with respect to
a particular set of DOF. The subject interested here is "dymanic
condensation", that condens eigenvalue equations. For the following example,

/                    \  /       \                /       \
| K_aa  K_ab  |  |  X_1 |=(lambda) |  X_1 |
| K_ba  K_bb  |  |  X_2 |               |  X_2 |
\                   /   \       /               \        /

(Due to different font set, it may be difficult in reading the previous
equation. Please re-shape it if necessary)

Conden out the subset {X_2}, and get the equation [D_aa]{X_1}=(lambda){X_1},
where {X_1} is a subset of {X} and the (labmda) solved in small equation is
also eigenvalue of the original equation.

Any references to "dynamic condensation"? Thank you.