Oes Plato offer a coherent theory of love in the Symposium?

Suggested bibliography:
Plato a Symposium
Simon Blackburn, Lust, ch 3
G. Vlastos, a?The Individual as an Object of Love in Platoa, in Eros, Agape, and Philia, ed. A. Soble, and in Platonic Studies, Vlastos.
L.A. Kosman, a?Platonic Lovea?, in Soble, op.cit
J. Brentlinger, a?The Nature of Lovea?, in Soble
M. Nussbaum, a?The Speech of Alcibiades: A Reading of Platoas Symposiuma, in The Philosophy of Erotic Love, ed. Solomon and Higgins.
Fergus Kerr, Immortal Longings, chs 1, 4.
Iris Murdoch, The Fire and the Sun
Metaphysics a Guide to Morals
The Sovereignty of Good
R. Solomon, Love: Emotion, Myth, and Metaphor, ch 7
Stella Sanford, The Metaphysics of Love, ch 4 (A rather complex but sometimes insightful discussion of the relation between Levinas and Plato).
Drew Dalton, Longing for the Other (part 1 offers a good discussion of the relation between Plato and Levinas).