Ryser's conjecture on transversals in latin squares

A latin square of order $n$ is an $n\times n$ array filled with $n$ symbols so that each row and column contains every symbol exactly once. A transversal is a set of $n$ entries containing exactly one entry from each row and each column, with all $n$ symbols represented. Ryser's conjecture. Every latin square of odd order has a transversal. This is a classical existence conjecture concerning transversals in latin squares; the supplied source gives no resolution status.