@misc{1198321, author = {Joan Tyler}, title = {A planning model for unifying information modeling languages for product data exchange specification (PDES):}, year = {1990}, month = {1990-01-01 05:01:00}, publisher = {, National Institute of Standards and Technology, Gaithersburg, MD}, doi = {https://doi.org/10.6028/NIST.IR.90-4234}, language = {en}, }