J
[JL04] David Janin and Giacommo Lenzi. On the Relationship Between Monadic and Weak Monadic Second Order Logic on Arbitrary Trees. Fundamenta Informaticae 61(3-4):247-265. IOS Press, 2004. 
@article{fundi61(3-4)-JL,
  author =              {Janin, David and Lenzi, Giacommo},
  title =               {On the Relationship Between Monadic and Weak Monadic
                         Second Order Logic on Arbitrary Trees},
  publisher =           {IOS Press},
  journal =             {Fundamenta Informaticae},
  volume =              {61},
  number =              {3-4},
  pages =               {247-265},
  year =                {2004},
}
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