“…In Nizhny Novgorod State Technical University, a team led by Mal’tsev conducted studies on sintering of powders during rolling [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. In the middle of the 1960s, Frantsevich Institute for Problems of Materials Science developed a sintering method based on the use of high-frequency currents [ 69 , 70 , 71 , 72 , 73 ]. Dresvyannikov, Kolpakov, Doronin and other researchers of Kazan State Technical University conducted studies on spark plasma sintering [ 21 , 23 , 74 , 75 , 76 , 77 , 78 , 79 ].…”