Creating an "In" Restriction with Linq to NHibernate

Anybody know how I can create an "In" restriction using Linq to NHibernate.

i.e. generate SQL like

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select p.Name from Person p where p.City In ('London', 'New York', 'Auckland')

thanks.

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OK, I worked this out. Can do:

from p in session.Query<Person> where cities.Contains(p.City) select p

where cities is an array of city names

Anyone know a good reference for Linq to NHibernate examples?