Geodesic
The $p$-variation of functions
Matematičeskie zametki, Tome 5 (1969) no. 2, pp. 195-204.

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A formula is derived for the $p$-variation of functions of the class $V_q$ ($1\leqslant q$) and it is proved that this formula ceases to hold when $1$, in contrast to the case $q=р=1$. 
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     author = {B. I. Golubov},
     title = {The $p$-variation of functions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {195--204},
     publisher = {mathdoc},
     volume = {5},
     number = {2},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_5_2_a6/}
}
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B. I. Golubov. The $p$-variation of functions. Matematičeskie zametki, Tome 5 (1969) no. 2, pp. 195-204. http://geodesic.mathdoc.fr/item/MZM_1969_5_2_a6/