Geodesic
A Commutator Formula for a Pair of Subgroups and A Theorem of Blackburn
Canadian mathematical bulletin, Tome 12 (1969) no. 2, pp. 217-219

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Let be the lower central series of a group G, where K2(G) = [G, G] and inductively Kn+1(G) = [Kn (G), G]. A theorem of Blackburn ([1], Hilfssatz) states thatTheorem 1. The exponent of Kn+1 (G)/Kn+2 (G) divides the exponent of Kn (G)/Kn+1 (G). 
Lam, Tsit-Yuen. A Commutator Formula for a Pair of Subgroups and A Theorem of Blackburn. Canadian mathematical bulletin, Tome 12 (1969) no. 2, pp. 217-219. doi: 10.4153/CMB-1969-025-5
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     title = {A {Commutator} {Formula} for a {Pair} of {Subgroups} and {A} {Theorem} of {Blackburn}},
     journal = {Canadian mathematical bulletin},
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     year = {1969},
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     doi = {10.4153/CMB-1969-025-5},
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