| Article ID: | iaor1988704 |
| Country: | Germany |
| Volume: | 20 |
| Start Page Number: | 147 |
| End Page Number: | 161 |
| Publication Date: | Jan 1989 |
| Journal: | Optimization |
| Authors: | Palata J. |
Relations between different conical approximations to the set in the neighbourhood of a point from its closure used in the optimization theory are given.