This pattern is in the book Dubultcimdi (Double Mittens) by Rasmas Aboltinas (Rasma Aboltina). The book is written in both Latvian and English and explains how to knit stranded double knit mittens where you knit a stranded mitten on the outside at the same time as you knit the mitten liner. The book has been provided free to the general public via a link to the website of the Latvian National Center of Culture. There are photos of many different double mittens and instructions and a chart for a pair of mittens with a rose design.

The pattern in Latvian starts on page 12. The pattern in English starts on page 18.