General rules of explosion-protect techniques of reciprocating internal combustion engines for explosive atmospheres - Part 3: Group I engines for use in underground workings susceptible to firedamp and/or combustible dust
General rules of explosion-protect techniques of reciprocating internal combustion engines for explosive atmospheres - Part 2: Group Ⅱengines for use in flammable dust atmospheres
General rules of explosion-protect techniques of reciprocating internal combustion engines for explosive atmospheres - Part 1: Group Ⅱengines for use in flammable gas and vapor atmospheres