A rule of thumb derivation of the Dirac-Born-Infeld action for D-brane
s is studied ci la Fradkin and Tseytlin, by simply integrating out of
the superstring coordinates in a narrow strip attached to the D-branes
. In case of superstrings, the coupling of Ramond-Ramond fields as wel
l as the Dirac-Born-Infeld type coupling of the Neveu Schwarz-Neveu Sc
hwarz fields come out in this way.