After five years devoted to writing a four volume monograph on linear partial differential operators, I spent the academic years 1984-86 as director of the Mittag-Leffler Institute in Stockholm. I had only accepted a two year appointment with leave of absence from Lund since I suspected that the many administrative duties there would not agree very well with me.
Pagkatapos ng limang taon mapagmahal sa pagsulat ng isang apat na dami ng monograp sa guhit bahagyang kaugalian operator, nagastos ko ang mga akademikong taon 1984-86 bilang direktor ng Mittag-Leffler Institute sa Stockholm. I had lamang na tinanggap ng dalawang taon appointment sa iwan ng pagliban sa Lund magmula ng ako hinihinalang na ang maraming mga administrative tungkulin doon ay hindi sumasang-ayon maayos sa akin.