@Article{LIS4,<br>title = {A Geometric Modeling System for Automated Mechanical Assembly},<br>author = {M. A. Wesley and T. Lozano-Perez and L. I. Lieberman and M. A. Lavin and D. D. Grossman},<br>year = {1980},<br>url = {http://lis.csail.mit.edu/pubs/tlp/ibm-journal-r&amp;d-1980.pdf},<br>journal = {IBM Journal of Rsearch and Development},<br>volume = {24},<br>number = {1},<br>pages = {64--74},<br>}