ياسين بن سعيد بن عبد الله الحاشدي
Here is an excellent collection of 2 books, the first on the fundamentals and rules to be observed during the fitan period.
It contains: the definition of fitans, the importance of the subject of fitans, the causes of fitans, the different kinds and types of fitans, their effects, and finally 30 foundations and rules to be observed in their period.
And the second a very detailed research on the status of the demonstrations, we find there: the definition of the demonstration, its genres, its status with 5 very detailed proofs of its ban then finally an answer to the ambiguities of those who authorize the demonstrations .
496 pages, yellow pages, size 17x24 cm, hardcover, دار النصيحة edition.