Topix is a series which was published by Bastei Verlag in Western Germany between May 1976 until September 1978. 29 editions were published on a monthly basis, with the Phantom appearing in 3 editions.
Each edition was published in full color and contains 52 pages. They are larger then traditional comic books, measuring 21 cm x 29 cm.
Although these comics were published in German text, they were sold in various European counties besides Germany, including Belgium, France, Italy, Luxembourg, Netherlands, Austria, Spain and Switzerland.
As noted above, only 3 editions were dedicated to the Phantom, numbers 7, 11 and 23 as can be seen below.
A sample of internal pages can be seen below.
The Phantom 