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[[Liedtke]] explains in [On Microkernel Construction](http://l4ka.org/publications/paper.php?docid=642)
that a microkernel attempts to minimize the mandatory part of the operating
system by providing the minimal number of [[mechanism]]s that
maximize the flexibility of implementation (by imposing minimal
[[policy]]) while allowing the efficient implementation of the
remainder of the system.
The idea of a microkernel as explained above was first explored
by Per Brinch-Hansen in 1970 in
[The Nucleus of a Multiprogramming System](http://brinch-hansen.net/papers/1970a.pdf).
Other notable microkernels include Hydra, KeyKOS, Eros and L4.
An [introduction](http://www.cs.cornell.edu/Info/People/ulfar/ukernel/ukernel.html) by
Úlfar Erlingsson and Athanasios Kyparlis (from 1996) to microkernel concepts.
[[Research]].
[[Microkernels_for_beginners|for_beginners]].
A 2002 article about [[microkernel_FUD|FUD]] (Fear, Uncertainty, Doubt).
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