Geodesic
Conjugate points of the geodesies
Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 2 (1995) no. 3, pp. 338-346 
M. A. Ulanovskii. Conjugate points of the geodesies. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 2 (1995) no. 3, pp. 338-346. http://geodesic.mathdoc.fr/item/JMAG_1995_2_3_a7/
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     author = {M. A. Ulanovskii},
     title = {Conjugate points of the geodesies},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {338--346},
     year = {1995},
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     url = {http://geodesic.mathdoc.fr/item/JMAG_1995_2_3_a7/}
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Voir la notice de l'article provenant de la source Math-Net.Ru

One considers sets formed of “first” conjugate points along nil geodesies with regard to some fixed point.