How to unload MC from memory?

While running my app I need to create and kill MCs rapidly.
Now I use "stage.removeChild(...);" Is this method removes created
clip from memory, or they still stuck somewhere and eat my precious
memory until it runs out and hang player?

There is only mention I've found that's the removed MC must
not have any other reference to it, then it will be placed in GC
and disposed of. So the other question appears: How to monitor MC's
references? Some times it's really hard to keep in mind all of data
structure of an application. So, is there a way to get referrers
from an Object?

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