Clustering of Intermittent Magnetic and Flow Structures near Parker Solar Probe's First Perihelion-A Partial-variance-of-increments Analysis - Chhiber, R; Goldstein, ML; Maruca, BA; Chasapis, A; Matthaeus, WH; Ruffolo, D; Bandyopadhyay, R; Parashar, TN; Qudsi, R; de, Wit TD; Bale, SD; Bonnell, JW; et al. (ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2020)