|I don't know what you mean by "a1 colom, b1 colom ref", etc.|
A1 and B1 are cells, not Columns.
I also don't know what you mean by "find minium value all a1 colom sheets with ref. b1 colom of all sheet". Mainly I don't understand what you mean by "with ref. b1 colom ".
If you want to find the minimum value in Column A of all sheets, you can use:
Where Sheet1 and Sheet3 are the names of the first and last sheets in your workbook.
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