for forth topic: 1) https://www.sciencedirect.com/science/article/pii/S0273122399004394 2) https://www.sciencedirect.com/science/article/pii/S0307904X01000208   for third: 1) https://www.sciencedirect.com/science/article/pii/S0360544217317899 2) https://www.sciencedirect.com/science/article/pii/S0034425717302195   for second: 1) https://www.sciencedirect.com/science/article/pii/S2444883417300232 2) https://www.sciencedirect.com/science/article/pii/S0165176518300284   for first: 1) https://www.sciencedirect.com/science/article/pii/S2212420916304411 2) https://www.sciencedirect.com/science/article/pii/S092180091731159X

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for forth topic:

1) https://www.sciencedirect.com/science/article/pii/S0273122399004394

2) https://www.sciencedirect.com/science/article/pii/S0307904X01000208

 

for third:

1) https://www.sciencedirect.com/science/article/pii/S0360544217317899

2) https://www.sciencedirect.com/science/article/pii/S0034425717302195

 

for second:

1) https://www.sciencedirect.com/science/article/pii/S2444883417300232

2) https://www.sciencedirect.com/science/article/pii/S0165176518300284

 

for first:

1) https://www.sciencedirect.com/science/article/pii/S2212420916304411

2) https://www.sciencedirect.com/science/article/pii/S092180091731159X