He also had to promise to not start a new publishing house within the next seven years .
In 1933 , Mortensen started Norsk Ukeblad , but had to sell it along with Nasjonalforlaget one year later .
Mortensen also had to promise to not start a new publishing house within the next seven years .
In 1933 , Mortensen started Norsk Ukeblad , but had to sell it along with Nasjonalforlaget one year later .