I've been trying to find any such papers using the
Web of Knowledge database of peer-reviewed literature. I've been using search terms like "Productivity", "Wage", "Performance", "Salary", "Hard-Work" etc all in various combinations. What comes across is that the topic is too vague, there have been many specific studies along the lines of "a comprehensive analysis of wage disparity across ethnicity/sex/age self-employment in industry X" but nothing exactly fitting your bill. Perhaps you will have better luck.
Part of the problem is that
nobody adequately defines what they are talking about when they say this. "Working hard" doesn't really mean much, when I was at university I worked throughout the summer at a campsite. I worked damn hard averaging 10 hour days often spiking to 14 hours (often with no breaks, lunch was taken whilst working), sometimes I did this for over two weeks without a day off. My pay was not good for how much I worked. At the time a friend of mine was on a summer work placement with a pharmaceutical company, they worked 40 hour weeks (a lot of which was spent browsing the internet waiting for something to do), frequently enjoyed 2 hour lunch breaks and got paid far more.
This isn't an unusual set up, wage isn't determined by man hours it's determined by how much money the employer can get away with paying which is related to how much money they have (in turn related to how well the company and industry are doing) and how much the employee is looking for (relating to how desperate they are for money and how many other options they have). Consequently the idea that working hard results in more money only works in an ideal system with few variables.
It get's harder when people argue "well X may work less hours than Y but X's work
means more". But then that's shifting the goal posts isn't it? If you work 30 hour weeks as a city exec and rake in a million a month you, as an individual, could be working far less than a nurse working 60 hour weeks.
The truth is there is no easy path to wealth, however on average it is probably sensible to say that there are lists of attributes that if one has one will be more likely to get rich e.g. dedication, long-hours, aptitude etc, but there is also a list of circumstances that will facilitate this process that are outside of ones control e.g. luck-of-the-market, health problems, social problems etc.