Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 343-348

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 349-357

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 359-370

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 371-376

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 377-385

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 387-391

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 393-401

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 403-413

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 415-420

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 421-422

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 423-425

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 427-428

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 429

Published in Gulf Research Reports, in 1980, in volume 6, issue 4, pages 431-451