no. 2
Conformal covariance and invariant formulation of scalar wave equations
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 11 (1969) no. 2, pp. 207-220 
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     author = {Tugov, I. I.},
     title = {Conformal covariance and invariant formulation of scalar wave equations},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {207--220},
     year = {1969},
     publisher = {Gauthier-Villars},
     volume = {11},
     number = {2},
     mrnumber = {250622},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1969__11_2_207_0/}
}
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Tugov, I. I. Conformal covariance and invariant formulation of scalar wave equations. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 11 (1969) no. 2, pp. 207-220. https://www.numdam.org/item/AIHPA_1969__11_2_207_0/

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