Memoirs of the American Mathematical Society ; number 41
Print version: Wong, Yung-chow. Isoclinic n-planes in Euclidean 2n-space, Clifford parallels in elliptic (2n-1)-space, and the Hurwitz matrix equations. Providence, Rhode Island : American Mathematical Society, [1961] 112 ; 26 cm Memoirs of the American Mathematical Society ; no. 41 ISBN 9780821812419