====== Nearest neighbors ======

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C:\Users\batagelj\Documents\papers\2020\zametki
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  * https://en.wikipedia.org/wiki/Nearest_neighbor_search
  * https://en.wikipedia.org/wiki/K-nearest_neighbors_algorithm
  * https://www.analyticsvidhya.com/blog/2018/03/introduction-k-neighbours-algorithm-clustering/
  * https://www.sciencedirect.com/topics/computer-science/nearest-neighbour
  * https://www.tutorialspoint.com/machine_learning_with_python/machine_learning_with_python_knn_algorithm_finding_nearest_neighbors.htm
  * https://machinelearningmastery.com/tutorial-to-implement-k-nearest-neighbors-in-python-from-scratch/
  * https://www.mathworks.com/help/stats/knnsearch.html
  * https://pubmed.ncbi.nlm.nih.gov/16724588/
  * https://arxiv.org/abs/1906.12211
  * https://www.inferentialthinking.com/chapters/17/1/Nearest_Neighbors.html
  * https://help.alteryx.com/2018.3/K_Nearest_Neighbors.htm
  * https://neo4j.com/docs/graph-algorithms/current/labs-algorithms/approximate-nearest-neighbors/
  * https://github.com/KristofferC/NearestNeighbors.jl
  * https://www.pks.mpg.de/~tisean/Tisean_3.0.1/docs/chaospaper/node9.html
  * https://logic.pdmi.ras.ru/~yura/nearest-neighbors.html
  * https://ailab.ijs.si/nenad_tomasev/files/2011/08/cikm0065-tomasev.pdf
  * https://awesomeopensource.com/projects/nearest-neighbor-search
  * https://www.codementor.io/@volodymyrlut/k-nearest-neighbors-explained-13jm2ii1gx
  * http://www.stat.cmu.edu/~cshalizi/dm/19/lectures/09/lecture-09.html ; http://www.stat.cmu.edu/~cshalizi/dm/19/
  * http://www.stat.cmu.edu/~cshalizi/dm/19/lectures/11/lecture-11.html#(1)
  * https://link.springer.com/article/10.1007/BF02187718
  * https://ieeexplore.ieee.org/abstract/document/4472264
  * http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.10.3826
  * https://journals.aps.org/pre/abstract/10.1103/PhysRevE.47.3057
  * https://ieeexplore.ieee.org/abstract/document/4309418
  * https://www.sciencedirect.com/science/article/pii/S0950705116000794
  * https://www.sciencedirect.com/science/article/abs/pii/S0098135497876570
  * https://link.springer.com/chapter/10.1007/978-3-642-38652-7_2
  * https://www.sciencedirect.com/science/article/pii/S002002551630158X
  * https://www.pnas.org/content/108/38/15679.short
  * https://ieeexplore.ieee.org/abstract/document/4568202
  * https://link.springer.com/chapter/10.1007/978-90-481-3660-5_14
  * https://www.sciencedirect.com/science/article/pii/0047259X9290079U
  * https://amstat.tandfonline.com/doi/abs/10.1080/01621459.1986.10478337
  * https://journals.aps.org/pre/abstract/10.1103/PhysRevE.85.026114
  * https://link.springer.com/chapter/10.1007/978-3-540-30570-5_11
  *