Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 161-164

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 165-196

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 197-213

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 215-239

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 241-258

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 265-281

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 283-289

Published in Gulf Research Reports, in 1971, in volume 3, issue 2, pages 291-345