Degtyarev, A.2016-02-082016-02-0820110030-6126http://hdl.handle.net/11693/21779We develop a modification of the Zariski-van Kampen approach for the computation of the fundamental group of a trigonal curve with improper fibers. As an application, we list the deformation families and compute the fundamental groups of all irreducible maximizing simple sextics with a type D singular point.EnglishArticle