Jakob Jakobsen, An Etymological Dictionary of the Norn Language in Shetland…
“ The phonology of the Norn words handed down is on the whole somewhat confused, largely owing to the strong Scottish influence, an influence which has made the vowel-system very diversified. In a large number of cases, different forms of a word exist side by side (differing in different districts, but sometimes differing in one and the same district) , frequently representing different stages of development. ”
