Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 180, pages 1-150

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 182, pages 1-13

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 183, pages 1-3

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 184, pages 1-7

Published in Stuttgarter Beiträge zur Naturkunde, in 1968, in volume 186, pages 1-42

Published in Stuttgarter Beiträge zur Naturkunde, in 1968, in volume 187, pages 1-12

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 188, pages 1-6

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 189, pages 1-43

Published in Stuttg. Beitr. Naturk., in 1968, in volume 190, pages 1-18

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 191, pages 1-48

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 192, pages 1-6

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 193, pages 1-23

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 194, pages 1-40

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 195, pages 1-15

Published in Stuttgarter Beiträge Naturkunde, in 1968, in volume 196, pages 1-8