I have links for PDFs of the english stalker books, They are free.
S.T.A.L.K.E.R: Southern comfort
and S.T.A.L.K.E.R: Northern passage
SC: In 2011, another Zone is apparently created after Al-Qaeda detonated nukes in Afghanistan. Ukrainian authorities send a research team to verify the claims. The scientists go missing and a search and rescue operation is launched.
NP:In the New Zone, the Exclusion Zone?s vast twin phenomenon and apparently created after nuclear warheads devastated Afghanistan in 2011, renegade US Marines calling themselves the Tribe patrol the mountain ranges, Stalkers try to establish themselves in ruins of Bagram Air Base and mutated predators migrate to the anomaly-infested plains. All these dangers can not dissuade those hardy souls who brave the New Zone. But whatever their motives, however great their courage, a new power is arising and its vicious plan threatens to destroy them all.
Links:
SC:
https://www.smashwords.com/books/view/264776
NP:
https://www.smashwords.com/books/view/266392