recently also in languages such as Estonian and Polish. Among the books he published in the first four years of his writer career are three of the autobiographical books that form the rainbow series. Those are true and about his own life Those start with Regnbågen har bara åtta färger (The rainbow has only eight colours). In this book, Pohl described his early childhood, starting immediately after he moved to Sweden, until he was eight years old. The story takes place between 1945 and 1948. It is followed by Medan regnbågen bleknar (While the rainbow is fading), covering the period 1949 – 1952. Vilja växa (Want to grow up) described the period 1952 – 1958. The fourth book, Vi kallar honom Anna, he describes one year, particularly one summer, where he, part of the summercamp organisation, observes how a teenage boy is severely bullied. This book was published before Medan regnbågen bleknar and Vilja växa, just shortly after Regnbågen har bara åtta färger, and received a lot of attention and prizes. The final book in the series is Klara papper är ett måste, which starts in 1966. Additionally, the book De Stora Penslarnas lek, which Pohl describes as a starting point for his writing, contains fairy tales, based on the fairy tales from the grandfather in Regnbågen har bara åtta färger. Other books, such as I miss you, I miss you! and Sekten are based on true stories that came to him directly or indirectly. Some of his books were originally published as adult literature, but later recategorised as books for youth. Pohl does not consider himself an author of primarily youth literature. However, some books were written for children. Examples are Glittras uppdrag, a fairy tale about an angel that protects a six-year-old boy, and Malins kung Gurra, written for a contest organised by publisher Rabén & Sjögren. Bibliography Textbooks Linjära differensekvationer med konstanta koefficienter; Liber, 1976 Numeriska Metoder (with Gerd Eriksson and Germund Dahlquist); THS, 1977 220 ± 30 Exempel i Numeriska Metoder (with Gerd Eriksson); THS, 1978 Introduktion till BASIC-programmering; THS, 1979 Analytiska och Numeriska Metoder (with Eike Petermann); KTH, 1984 Elementära Numeriska Metoder; THS, 1991 Problem och Exempel i Numeriska Metoder; THS, 1992; Print on Demand 1997 Grunderna i Numeriska Metoder; THS, 1995; NADA, KTH 1999 Grundkurs i numeriska metoder; Liber, 2005. Fiction Janne, min vän (Johnny, My Friend), 1985. Translations: Danish (Min bedste ven, 1987),