Geodesic
Indicator Sets, Reguli, and a New Class of Spreads
Canadian journal of mathematics, Tome 29 (1977) no. 1, pp. 132-154

Voir la notice de l'article provenant de la source Cambridge University Press

Let Σ be the projective 3-space over the field GF(q) where q = pe, p an odd prime. A spread W in ∑ is a set of q2 + 1 lines in ∑ which are such that each point of Σ lies on exactly one line of W. Thus the lines of W are all mutually skew. The notion of a spread extends to higher dimensions and also applies for arbitrary fields [1; 3; 6, p. 29; 7, p. 5]. Our concern, however, will be within the narrower but still extensive bounds indicated. 
Sherk, F. A.; Pabst, Günther. Indicator Sets, Reguli, and a New Class of Spreads. Canadian journal of mathematics, Tome 29 (1977) no. 1, pp. 132-154. doi: 10.4153/CJM-1977-013-6
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