Publication Type: | Journal Article |
Year of Publication: | 1988 |
Authors: | I. B. Vasilev, Sabeva, S., Raichev, I. M. |
Journal: | Bulgarian Academy of Sciences, Sofia |
Publication Type: | Journal Article |
Year of Publication: | 1988 |
Authors: | I. B. Vasilev, Sabeva, S., Raichev, I. M. |
Journal: | Bulgarian Academy of Sciences, Sofia |