function iter=stef(func,x0,accur,num_iter)
	iter = [];
	iter(1) = x0;
	if(func(iter(1)) == 0)
		return;
	end
	for(i = 1:(num_iter))
		iter(i+1) = iter(i) - ((func(iter(i)))^2)/(func(iter(i)+func(iter(i))) - func(iter(i)));
		if(abs(iter(i+1)-iter(i)) < 10^(-accur))
			return;
		end
		if(func(iter(i+1)) == 0) 
			return;
		end
	end
end