mipmap

I’ve implemented MipMapping, but image is not good - one face of textured cube is not mipmapped( and it flickers), other are mipmapped and looks well. I also have such problem when there are many cubes - edge between mipmapped cubes and not mipmapped is too sharp. Cant it be fixed?
Which of constants like linear_mipmap_nearest is best and what is the difference?
Havent you seen articles on guts of mipmapping?
Thanks in advance

What form of texture filtering do are you using? (bilinear, trilinear, anisotropic)

I use no texture filtering(or i dont know if i use
I’m speaking about http://www.geocities.com/udodenko/GONDVANA.zip and http://www.geocities.com/udodenko/spots09.zip
Maybe I should blend texture somehow to reduce details? With smooth textures all is well.