@article{paperid:1027119, author = {Janfada, Mohammad and Niknam, Asadollah}, title = {On Two-parameter Dynamical Systems and Applications}, journal = {Journal of Sciences, Islamic Republic of Iran}, year = {2004}, volume = {15}, number = {2}, month = {November}, issn = {1016-1104}, pages = {163--169}, numpages = {6}, keywords = {Two-parameter semigroup; Generator}, }