Category "context-free-grammar"

CFG for L = {a^mb^nc^k: k = m×n}

Can we write CFG for this language? I searched multiple websites but I couldn't find any answers.

Are there tools to convert between ANTLR and other forms of BNF? [closed]

Are there any tools to convert ANTLR grammar syntax to and from other BNF syntaxes? There are several forms Backus-Naur Form (BNF, EBNF, ABNF,