Mathematics
Mathematics
JEFFREYS, HAROLD and BERTHA SWIRLES.
Methods of Mathematical Physic..Cambridge, University Press, 1956.
RITGER, PAUL D. and NICHOLAS J. ROSE.
Differential Equations with Ap..N.Y., Dover Publications, (2000).
LANDAU, LIFSHITZ, PITAEVSKII.
Electrodynamics of Continous M..Oxford, N.Y., Pergamon Press, n.date (ca 1980).