I. Bierenbaum, Johannes Blümlein, Sebastian Klein, Carsten Schneider,
"Two-Loop Massive Operator Matrix Elements for Unpolarized Heavy Flavor Production to $O!(epsilon)$"
, in Nuclear Physics B, Vol. 803, Nummer 1-2, Seite(n) 1-41, 11-2008, ISSN: 0550-3213
Original Titel:
Two-Loop Massive Operator Matrix Elements for Unpolarized Heavy Flavor Production to $O!(epsilon)$