IHEP 2004 - 11 (In Russian)
	G.G.Volkov (St.Peterburg Nuclear Physics Institute, Russia; IFT UAM, Madrid, Spain), A.A.Maslikov (IHEP, Protvino, Russia)
	Symmetries of the 4D hetrotic superstring and calculations of nonrenormalazible terms for effective lagrangian
	Protvino, 2004. – p.19, figs. 5, refs.:20.

In the article we discussed formalism of the 4-dimensional heterotic superstring, that describes additional internal degrees of freedom by free fermions with arbitrary boundary conditions. We introduse the problem of quasirealistic models that constructed in this approach.
We discuss the construction of acceptable nonrenormalizable terms of effective lagrangian in formalism of covariant verteces and operation of ghost picture changing taking into account all symmetries of the theory. We point the forms of all this terms until 9-th order inclusively and discuss the structure of higher orders.
In discussion we take as example the quasirealistic model with effective observing gauge group $U(5)\times U(3)$, that includes non-abelian horizontal group and describes $3+1$ generations. We count full superpotential of the model until 9-th order inclusively.

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