Geodesic
Two-loop Euler--Heisenberg lagrangian in dimensional renormalization
Teoretičeskaâ i matematičeskaâ fizika, Tome 113 (1997) no. 2, pp. 289-300

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By calculating the two-loop QED Euler–Heisenberg Lagrangian in dimensional regularization, we clarify a discrepancy between two previous calculations of this quantity, both performed in proper-time regularization. 
@article{TMF_1997_113_2_a5,
     author = {M. Reuter and D. Fliegner and M. G. Schmidt and C. Schubert},
     title = {Two-loop {Euler--Heisenberg} lagrangian in dimensional renormalization},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {289--300},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_113_2_a5/}
}
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M. Reuter; D. Fliegner; M. G. Schmidt; C. Schubert. Two-loop Euler--Heisenberg lagrangian in dimensional renormalization. Teoretičeskaâ i matematičeskaâ fizika, Tome 113 (1997) no. 2, pp. 289-300. http://geodesic.mathdoc.fr/item/TMF_1997_113_2_a5/