# Transformation Command
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This command is used to construct a multi-point constraint handler based
on the transformation equation method.
```tcl
constraints Transformation
```
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Reference:
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Gu Q., Barbato M., Conte J.P. (2009) “Handling of Constraints in Finite
Element Response Sensitivity Analysis.” Journal of Engineering Mechanics
(ASCE), 135(12):1427-1438.