Media type: E-Article Title: Fields of Logic and Computation II: Regularity Equals Monadic Second-Order Definability for Quasi-trees Contributor: Courcelle, Bruno imprint: Springer International Publishing, 2015 Published in: Fields of Logic and Computation II Language: Not determined DOI: 10.1007/978-3-319-23534-9_7 ISSN: 0302-9743; 1611-3349 Origination: Footnote: