Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 5-12

Published in Historia Naturalis Bulgarica, in 1997, in volume 7, pages 13-16

Published in Historia Naturalis Bulgarica, in 1997, in volume 7, pages 17-18

Published in Historia Naturalis Bulgarica, in 1997, in volume 7, pages 19-27

Published in Historia Naturalis Bulgarica, in 1997, in volume 7, pages 29-30

Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 31-33

Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 41-58

Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 59-60

Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 71-96

Published in Historia naturalis bulgarica, in 1997, in volume 7, pages 109-113

Published in Historia naturalis bulgarica, in 1997, in volume 8, pages 69-76

Published in Historia naturalis bulgarica, in 1997, in volume 8, pages 77-84

Published in Historia naturalis bulgarica, in 1997, in volume 8, pages 85-100

Published in Historia naturalis bulgarica, in 1997, in volume 8, pages 101-120

Published in Historia naturalis bulgarica, in 1997, in volume 8, pages 127-136