Product-conformal and product-concircular  courvature tensors
Novi Sad Journal of Mathematics, Tome 10 (1980).

Voir la notice de l'article provenant de la source Novi sad journal of mathematics website

@article{NSJOM_1980_10_Nonea_15,
     author = {Petrovi\'c Vojislav},
     title = {Product-conformal and 

 product-concircular~ courvature tensors},
     journal = {Novi Sad Journal of Mathematics},
     pages = {137-143},
     publisher = {mathdoc},
     volume = {10},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1980_10_Nonea_15/}
}
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 product-concircular  courvature tensors
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 product-concircular  courvature tensors
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Petrović Vojislav. Product-conformal and 

 product-concircular  courvature tensors. Novi Sad Journal of Mathematics, Tome 10 (1980). http://geodesic.mathdoc.fr/item/NSJOM_1980_10_Nonea_15/