Shemirat Shabbat Kehilchatah
Shemirat Shabbat Kehilchatah, also pronounced Shemiras Shabbos Kehilchosoh (Hebrew: שמירת שבת כהלכתה, lit. 'keeping Shabbat according to its law'; published in English as Shemirath Shabbath), is a book of halachah authored by Rabbi Yehoshua Yeshaya Neuwirth, which discusses the laws of Shabbat and Yom Tov, and is viewed by many as an authoritative work regarding these laws. Rabbi Neuwirth is a prominent student of Rabbi Shlomo Zalman Auerbach, and the book generally follows Rabbi Auerbach's opinions.
Source: Wikipedia — Shemirat Shabbat Kehilchatah (CC BY-SA 4.0)