Unsupervised 3D Ring Template Searching as an Ideas Generator for Scaffold Hopping: Use of the LAMDA, RigFit, and Field-Based Similarity Search (FBSS) Methods. - Martin Bohl; Björn Loeprecht; Bernd Wendt; Trevor W. Heritage; Nicola J. Richmond; Peter Willett 002 (J. Chem. Inf. Model., 2006)