Search and Browse the MSC 2000
19C09
Central extensions and Schur multipliers → ZMATH
19C20
Symbols, presentations and stability of $K_2$ → ZMATH
19C30
$K_2$ and the Brauer group → ZMATH
19C40
Excision for $K_2$ → ZMATH
19C99
None of the above, but in this section → ZMATH