Baker, George A..
Encyclopedia od Mathematics and its Applications Vol-13 / - First Ed.. / - London : Addison-Wesley Publishing Company. - p.257,xii :
0-201-13512-4
BObc / M1.1
Encyclopedia od Mathematics and its Applications Vol-13 / - First Ed.. / - London : Addison-Wesley Publishing Company. - p.257,xii :
0-201-13512-4
BObc / M1.1